Former top Trump administration officials have been lobbying GOP lawmakers to try and convict Trump at his upcoming impeachment trial. CNN's Jamie Gangel reports.

• Pelosi will send impeachment articles to Senate on Monday, Schumer says • Analysis: Lindsey Graham is playing a very odd role in the Senate impeachment trial

House Democrats plan to send the article of impeachment to the Senate on Monday, triggering the start of the Senate's trial of former President Donald Trump, Senate Majority Leader Chuck Schumer and House Speaker Nancy Pelosi said Friday. Unless senators strike an agreement to delay the trial, it would begin on Tuesday at 1 p.m. ET.

Lindsey Graham is a lawyer -- in addition to being the senior senator from South Carolina. Which means he should know way better than what he is doing in advance of former President Donald Trump's Senate impeachment trial.

• McConnell proposes delaying impeachment trial so Trump team can prepare • Florida man accused of being in Capitol riot was arrested at the inauguration

Questions have arisen over the constitutionality of former President Donald Trump's impending trial in the Senate. Trump is the first president to be impeached twice and would be the first ex-president to have his impeachment tried in the Senate while out of office.

The timing of former President Donald Trump's Senate impeachment trial is still unsettled while Senate leaders haggle over how a power-sharing agreement will govern a 50-50 Senate.

President Joe Biden is calling for unity, but with an impeachment trial of an ex-President around the corner, a long list of nominations still to be confirmed in the US Senate and Republicans already casting doubt on the need for another massive Covid-19 relief package, don't expect the mirage of bipartisanship to last long.

A faction of Senate Republicans has a warning for Minority Leader Mitch McConnell: Stick with former President Donald Trump during his impeachment trial.