Former GOP Sen. Gordon Humphrey (N.H.), a longtime critic of President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE, said on Wednesday the commander in chief is "sick of mind" and urged New Hampshire's lawmakers to support calls to remove him from office.

In a letter sent to Rep. Ann McLane Kuster (D-N.H.) first reported by local news station WMUR, Humphrey accuses Trump of making a bad situation worse with his recent promise that North Korea would face "fire and fury" if it continued to threaten the U.S.

"President Trump's threat to rain down 'fire and fury' on North Korea is like pouring gasoline on a fire," Humphrey wrote. "It's crazy."

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Humphrey asks Kuster to support a bill in the House that would establish a test to determine if the president is mentally fit for office.

"Donald Trump is seriously sick. He is dangerous," Humphrey said in the letter. "As a citizen, former U.S. Senator, and twelve-year member of the Armed Services Committee, I urge you to act [at] once.

"Donald Trump should be relieved of the powers of the presidency at the earliest date."

Humphrey said the escalating crisis with North Korea compels Congress to act.

"Donald Trump is impaired by a seriously sick psyche," he wrote. "His sick mind and reckless conduct could consume the lives of millions."

Humphrey supported Ohio Gov. John Kasich during the 2016 GOP primary and endorsed Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE in the general election. He trashed Trump repeatedly throughout the campaign, urging the RNC to replace Trump as the nominee months before Election Day.