​WASHINGTON — Republicans on Thursday launched a widespread boycott of ad spending on Twitter until the social media giant unlocks Senate Majority Leader Mitch McConnell’s campaign Twitter account.

President Trump’s re-election campaign, the Republican National Committee, the House and Senate GOP campaign arms and the Senate Leadership Fund all announced a suspension of ad spending, citing anti-conservative bias.

Depending on how long the boycott lasts, hundreds of thousands of ad dollars on Twitter could be at stake.

Trump’s re-election campaign alone had forecast between $300,000 and $500,000 in Twitter spending for August, the campaign told The Post.

McConnell’s Team Mitch campaign page was suspended Wednesday after posting a video of protesters outside the Senate majority leader’s home that included profane language and violent threats against him.

“We firmly believe that if a platform allows #massacremitch to trend but locks our account because we posted threats made against him, there is something deeply wrong with that platform,” Kevin Golden, McConnell’s campaign manager, said in a statement.

Richard Walters, chief of staff at the Republican National Committee, announced on Twitter that the Trump campaign and the RNC will stand with McConnell.

“Any future ad $ either organization was planning to spend with @Twitter has been halted until they address this disgusting bias,” he wrote.

The Senate and House Republican campaign arms also are pulling Twitter ad dollars, as well as Sen. Ted Cruz (R-Texas).

“I have directed the @NRCC to immediately halt all spending with @Twitter until they correct their inexcusable targeting of @Team_Mitch,” said Parker Hamilton Poling, executive director of the NRCC. “We will stand firmly with our friends against anti-conservative bias.”

“Twitter’s hostile actions toward Leader McConnell’s campaign are outrageous, and we will not tolerate it,” added Jesse Hunt, National Republican Senate Committee communications director. “The NRSC will suspend all spending with Twitter until further notice. We will not spend our resources on a platform that silences conservatives.”

Twitter locked out McConnell’s campaign from the platform after his team posted a video of protesters gathered outside his Kentucky home shouting that he should die.

It was in response to a dust-up that Team Mitch had with Rep. Alexandria Ocasio-Cortez over young McConnell supporters groping a cardboard cutout of the Bronx pol.

Twitter said it temporarily locked the account because the video violated its violent threats policy, “specifically threats involving physical safety.”

McConnell’s team, however, said the account was still locked as of Thursday.

Twitter did not immediately respond to a request for comment.