OPINION
Plaintiff-appellant Timothy Lewis brought a wrongful-termination claim against defendant-appellee Whirlpool Corporation alleging that he was terminated in violation of Ohio public policy for his refusal to discharge employees for unionizing activities. The district court dismissed Lewis’s complaint for lack of subject-matter jurisdiction, finding his claim preempted by the National Labor Relations Act, 29 U.S.C. § 158, which is to be interpreted and applied in the first instance by the National Labor Relations Board. We agree with the district court’s analysis and accordingly affirm.
I.
Lewis was employed by Whirlpool from August 17, 1977, through April 2, 2007, at its Marion, Ohio facility. In June 1997, Lewis was promoted to the position of Manufacturing Supervisor in the “Drum and Powder Process Area.”
In 2004, several Whirlpool employees began wearing pro-union shirts and meeting with union representatives. At this time, Whirlpool’s Marion facility was non-unionized. As a result of this unionizing activity, Lewis alleges that Whirlpool Division Vice President Stan Kinnett asked him to “build a case” and terminate two of the instigating employees. According to Lewis, he was informed that Whirlpool would retaliate against him if he did not follow Kinnett’s directive. Nevertheless, Lewis refused to terminate the employees.
In July 2005, Lewis was transferred to “Assembly,” an area of the Marion facility viewed as “the least desirable part of the plant in which to work.” While working in Assembly between July 2005 and February 2006, Lewis asserts that his direct supervisor “only spoke to [him] on one ... oceasion[,] despite the fact that other direct supervisors ... would communicate with their subordinates on a daily basis.” In February 2006, Lewis began to report to a new manager, who, according to Lewis, “constantly harassed” him over “minutiae.”
On March 29, 2007, Lewis was accused of “paying an employee for an entire shift despite the employee not being on the premises.” Lewis was also accused of “badging an employee,” which refers to when a supervisor clocks in one employee using the time badge of a different employee. Lewis denied these allegations, but nevertheless was suspended pending further investigation.
On April 2, 2007, Lewis was terminated for “badging an employee.” Lewis asserts that Whirlpool terminated him, despite its knowledge that it was another employee, Dusty Miller, who had “badged” the employee at issue.
Following his termination, Lewis filed a charge with the NLRB, asserting that he was terminated for his failure “to commit unfair labor practices on behalf of [Whirlpool] during a previous organization campaign among its production employees.” In November 2007, Lewis received a letter from a field examiner for the NLRB. This letter informed him that the NLRB Regional Director had “considered the complete investigative case file developed in connection with [Lewis’s] pending unfair labor practice charge” and determined “that no violation of the National Labor *487 Relations Act” had been demonstrated. Specifically, the letter provided that the charge against Whirlpool was “without merit since no clear evidence established that it terminated [Lewis’s] employment ... because [he] refused to commit unfair labor practices on its behalf during a previous union organizing campaign some three years” prior to his termination. The letter further informed Lewis that the Regional Director was prepared to dismiss his charge for lack of merit unless it was immediately withdrawn. Lewis thereafter withdrew his charge.
On March 31, 2009, Lewis filed a complaint in the Court of Common Pleas in Marion County, Ohio. Whirlpool subsequently removed the action to the United States District Court for the Northern District of Ohio based upon diversity jurisdiction. Lewis’s complaint asserted a single claim of wrongful termination. Specially, Lewis alleged that Whirlpool “violated Title 29 U.S.C. § 158(a)(3) of the National Labor Relations Act ... by discharging [him] for refusing to terminate subordinate union organizers,” and that as a result, the termination violated Ohio public policy.
On June 2, 2009, Whirlpool moved to dismiss Lewis’s complaint for lack of subject-matter jurisdiction, asserting that his claim is preempted by the NLRA. The district court agreed, granting the motion on September 2, 2009. This timely appeal followed.
II.
A district court’s dismissal of a complaint pursuant to Federal Rule of Civil Procedure 12(b)(1) for lack of subject-matter jurisdiction is reviewed de novo.
Gentek Bldg. Prods., Inc. v. Sherwin-Williams Co.,
Here, relying upon
San Diego Building Trades Council v. Garmon,
In
Garmon,
the Supreme Court held that “[w]hen it is clear or may fairly be assumed that the activities which a State purports to regulate are protected by § 7 of the National Labor Relations Act, or constitute an unfair labor practice under § 8, due regard for the federal enactment requires that ... jurisdiction must yield [to the NLRB].”
Id.
at 244,
Lewis asserts that his wrongful-termination claim is not “arguably subject” to the strictures of the NLRA because, as a former supervisor, he is not an “employee” covered by the Act. The parties neither dispute that Lewis was a “supervi
*488
sor,” as the term is defined by the Act,
1
nor that the NLRA does not generally protect supervisors from unfair labor practices.
2
However, a supervisor
does
have a viable claim under the NLRA when terminated or otherwise disciplined for
refusing to commit
unfair labor practices.
3
See USF Red Star, Inc. v. NLRB,
Lewis relies upon the November 2007 letter from the NLRB Field Examiner in asserting that his wrongful-termination claim is not covered by the NLRA. Specifically, he contends that the NLRB determined that it did not have subject-matter jurisdiction because Lewis was a supervisor, relying on a sentence in the letter that states: “It is undisputed that you served [Whirlpool] in the capacity of a ‘supervisor’ within the statutory meaning of Section 2(11) of the Act and, consequently, do not enjoy the protections guaranteed ‘employees’ under the Act.”
*489 Lewis mischaracterizes the substance of the letter. As noted by the district court, the letter clearly addresses the substance of Lewis’s claim, finding it to be “without merit.” Indeed, the very purpose of the letter was to inform Lewis that without the voluntary withdrawal of his charge, the NLRB would publish its finding of “no fault with respect to [Whirlpool’s] actions under review.” The jurisdiction of the NLRB is not questioned, but assumed in the November 2007 letter. 5
Because Lewis’s wrongful-termination claim is “arguably subject” to the NLRA,
Garmon
preemption is implicated.
Garmon,
The second factor of this analysis “is equivalent to the question of whether the state cause of action is ‘identical’ to a claim that could have been made to the Board.”
Id.
If the claims are identical, “then the Board has exclusive jurisdiction because the state regulation impinges directly on the Board’s prerogative to fashion a uniform labor policy.”
Id.
at 1027-28. Accordingly, when claims are identical, our analysis need go no further, as preemption is required.
See Sears, Roebuck & Co.,
*490 III.
In the alternative, Lewis asserts that the district court erred in dismissing his complaint because in doing so, the court denied him procedural due process. This argument has no merit.
First, we need not address Lewis’s due-process claim, as it was not raised before the district court.
See Hood v. Term. Student Assistance Corp.,
Lewis’s claim fails under the second prong of this analysis because he has received all the process the Constitution requires.
7
Lewis had an opportunity to be heard before the NLRB.
See Chavez,
IV.
In sum, we hold that Lewis’s wrongful-termination claim is preempted by the NLRA and his argument regarding procedural due process is wholly without merit. Accordingly, we affirm the district court’s dismissal of plaintiffs complaint for lack of subject-matter jurisdiction.
Notes
. A “supervisor” is defined by the NLRA as follows:
any individual having authority, in the interest of the employer, to hire, transfer, suspend, lay off, recall, promote, discharge, assign, reward, or discipline other employees, or responsibly to direct them, or to adjust their grievances, or effectively to recommend such action, if in connection with the foregoing the exercise of such authority is not of a merely routine or clerical nature, but requires the use of independent judgment.
29 U.S.C. § 152(11).
. Chapter 7 of the NLRA protects “employees” from "unfair labor practices.” 29 U.S.C. § 158(a). Supervisors are expressly excluded from the definition of "employee.” 29 U.S.C. § 152(3) (“The term employee’ ... shall not include ... any individual employed as a supervisor.”).
. It is undisputed that if Lewis had terminated Whirlpool employees for unionizing activities, such terminations would constitute unfair labor practices. 29 U.S.C. § 158(a)(3).
'.
At oral argument, Lewis relied upon
Fortier v. United Food and Commercial Workers Union Local 876,
Civ. No. 05-CV-60004,
. This is not the first instance in which a letter from the NLRB has been misconstrued in this manner. In
Local 926, International Union of Operating Engineers, AFL-CIO v. Jones,
. Several courts have .found preemption to be required under circumstances indistinguishable from those presented here. Specifically, such courts have found state-law claims for wrongful termination to be preempted when a supervisor claimed he was discharged for refusing to commit unfair labor practices.
See Sitek v. Forest City Enters., Inc.,
. A legal cause of action is a protected property interest.
Logan v. Zimmerman Brush Co.,
. In the February 2007 letter, Lewis was informed that, absent the voluntary withdrawal of his charge, a final letter would issue dismissing his claim on the merits, which would be appealable to the Board’s Office of Appeals.
