GOP congressman Adam Kinzinger could face a court martial after lashing out at Wisconsin governor

Republican U.S. Rep. Adam Kinzinger is also Wisconsin Air National Guard pilot. Recently, he criticized Gov. Tony Evers' decision to withdraw troops from the U.S.-Mexico border.

Kinzinger slammed Evers, who is a Democrat, in a series of scathing tweets.

Now, the Associated Press reports that the National Guard is investigating whether Kinzinger critique of the governor's action are a dereliction of duty.

According to Wisconsin statutes, any commissioned officer who uses "contemptuous words against the president, the vice-president, members of congress, the secretary of defense, the secretary of a military department, the secretary of homeland security, or the governor or legislature of the state of Wisconsin shall be punished as a court-martial may direct."

In a statement to local media, his spokeswoman defended the Congressman, citing his right to free speech.

"The Congressman is off-duty and has the right to exercise his freedom of speech as he so chooses, just as he has done when critical of the current President and the President before him," Maura Gillespie said.