Conservative radio host and constitutional scholar Mark Levin is slamming House Speaker Nancy Pelosi after she threatened to withhold two articles of impeachment against President Trump from the Senate Wednesday night.

"Nancy Pelosi was apparently advised by leftwing Harvard law professor Lawrence Tribe to delay sending the impeachment to the Senate. So she’s unilaterally sitting on the impeachment. This is another brazen unconstitutional act," Levin wrote Thursday morning on his Facebook page.

"Here’s what Mitch McConnell and the Senate Republicans must do in response: The Senate has the sole power under the Constitution to adjudicate an impeachment. Therefore, Pelosi is attempting to obstruct the Senate’s power to act on its constitutional authority. McConnell should immediately put an end to this and declare the impeachment null and void as the speaker has failed to complete the impeachment process by timely sending it to the Senate for adjudication," he continued. "McConnell has no less authority to unilaterally make such a decision than Pelosi does to withhold the administrative notification of an impeachment to the Senate either indefinitely or with conditions. Her effort to cripple the presidency and blackmail the Senate must be defeated."

As Matt covered last night, Pelosi threatened to hold the articles if the Senate doesn't agree to conduct a "fair trial."

Reporter: Can you guarantee that the impeachment articles will be at some point sent to the Senate? Can you guarantee that? @SpeakerPelosi: That would've been our intention, but we'll see what happens over there. pic.twitter.com/oEEtK0nDdH — Townhall.com (@townhallcom) December 19, 2019

We're still waiting on a decision about whether she will hand this off to McConnell.