Former White House chief strategist Steve Bannon has called for Senate Republicans to remove Majority Leader John Thune from leadership.

Bannon revealed his frustration with Thune in an exclusive preview of the Sean Spicer show set to air Friday evening.

Bannon called it 'unacceptable' that the Senate was treating President Donald Trump as a 'lame duck.'

Bannon specifically pointed to Thune's failure to force through Trump's Save America Act in the Senate, even while sending fundraising emails promising small donors that he was fighting to pass it.

The SAVE Act, if passed through the Senate, would require American citizens to present proof of citizenship to register to vote in federal elections.

Thune has said he does not have the 51 votes necessary to pass the bill, angering Senate conservatives who want to push the President's signature legislation through.

Bannon called Thune a 'holdover' from the team run by Republican Senator Mitch McConnell of Kentucky, and said it was time for him to go.

'As a leader to me, he's failed the President, failed the party, and failed the country,' Bannon said.

Bannon, the host of his own War Room podcast, is famous for rallying populist nationalist grassroots activists toward important causes.

Bannon confirmed in a statement to the Daily Mail that he was launching a 'call to action' to remove Thune.

'We are working now on making it happen - the only way to save the Senate,' he said.

Bannon did not cite a potential Republican senator to replace Thune, but insisted it was time for him to be forced out of power.

'Anybody's going to be better than Thune,' he said.

Republicans currently hold a slim Senate majority controlling 53 seats, but may lose their majority to Democrats in the midterm elections.