Senate Democrats are proposing a weeks-long Senate impeachment trial seeking testimony from four new witnesses including John Bolton and Mick Mulvaney over President Donald Trump’s actions toward Ukraine.

Senate Democrats released a detailed outline of their trial proposal on Sunday.

Senate Minority Leader Chuck Schumer of New York proposed the structure for what he called a ‘’fair and honest’’ trial in a letter to Senate Majority Leader Mitch McConnell.

The outline is an attempt to launch negotiations ahead of House voting this week that is all but certain to result in the president being impeached.