Mark Levin on Thursday encouraged President Trump to keep fighting against the Democrats' impeachment inquiry and demanded House Intelligence Committee Chairman Adam Schiff, D-Calif., be made to testify during his own proceedings.

Levin -- whose Fox News Channel program "Life, Liberty & Levin" moves to 8 PM ET on Sunday evenings -- told "Hannity" that Schiff and his party were attacking Trump on shaky grounds.

"The law is on the president's side, the facts are on the president's side," he said of Trump's overtures with Ukraine that have been under scrutiny in the House of Representatives.

"What they're attacking is the transition of power. They have never supported the transition of power from the Obama administration to a Trump administration."

GAETZ: TRUMP IMPEACHMENT INQUIRY IS DEMOCRATS' 'COP-OUT' FOR LACK OF A PRODUCTIVE AGENDA

Levin said Trump was able to appoint "whomever he wants" to foreign policy positions and was allowed to conduct foreign policy in the way he chose.

At the same time, Levin accused former President Obama of failing to supply sufficient military aid to Ukraine -- which Democrats have claimed Trump withheld in a "quid pro quo" scenario.

"The president sets foreign policy," Levin said. "It doesn't make a damn's worth of difference if you don't agree with it. I don't care what a former Obama ambassador [to] Ukraine thinks."

Of former Ambassador Marie Yovanovitch's critiques and the fact that Trump ordered her to be recalled earlier this year, Levin remarked, "too damn bad."

Turning his attention back to the House Intelligence Committee chairman, Levin called on the Ukraine whistleblower -- and Schiff himself -- to testify before the impeachment inquiry hearings.

"The whole house of cards will collapse and the American people will see [that] this was an outrageous, unconscionable attack by them on the president," Levin claimed.

CLICK HERE TO GET THE FOX NEWS APP

"Mr. President -- stay strong -- this'll collapse, eventually."

In addition, host Sean Hannity urged Schiff to request that former Vice President Joe Biden and his 49-year-old son Hunter Biden testify in the proceedings.