Illinois Sen. Mark KirkMark Steven KirkOn the Trail: Senate GOP hopefuls tie themselves to Trump Biden campaign releases video to explain 'what really happened in Ukraine' Why Republicans are afraid to call a key witness in the impeachment inquiry MORE (R) slammed Rep. Dennis Kucinich (D-Ohio) for raising the possibility of impeaching President Obama over the Libyan mission.

“I think Dennis Kucinich is one of the most irresponsible, fringe members of Congress and hardly anyone in Congress listens to him,” Kirk said Thursday on local radio station WLS 890.

Kucinich has criticized Obama for intervening in Libya without going to Congress for authorization first.

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Earlier this week, the liberal lawmaker questioned whether a president who brings the U.S. into a military engagement “without following the Constitution” could be impeached. He has also promised to press for a vote on defunding the Libyan operation.

Kirk’s comments came in defense of President Obama’s decision to authorize U.S. military involvement in Libya. Obama is upholding a United Nations Security Council resolution to take measures, including setting up a no-fly zone over Libya, to protect civilians from Libyan military forces lead by dictator Col. Moammar Gadhafi.

It’s not just Kucinich who has been irked by a perceived lack of consultation from the administration. Republicans, including Speaker John BoehnerJohn Andrew BoehnerMeadows joins White House in crisis mode Meadows set to resign from Congress as he moves to White House The Pelosi administration MORE (Ohio), have also criticized the White House on the issue.

BoehnerJohn Andrew BoehnerMeadows joins White House in crisis mode Meadows set to resign from Congress as he moves to White House The Pelosi administration MORE on Wednesday sent a letter to Obama arguing that the president had failed to set out the mission’s goals to Congress and the public.