Senate Republicans on Friday night rejected a last-ditch effort to subpoena former national security adviser John Bolton John BoltonThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep DOJ launches probe into Bolton book for possible classified information disclosures Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE and acting chief of staff Mick Mulvaney Mick MulvaneyMick Mulvaney to start hedge fund Fauci says positive White House task force reports don't always match what he hears on the ground Bottom line MORE.

The back-to-back votes, forced by Democrats, marked an 11th hour effort to try to get witnesses included in President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE's impeachment trial.

The move came after the Senate voted to reject a mid-trial effort to allow for witnesses and documents in a 51-49 vote, falling short of the simple majority needed.

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Democrats' first measure on Friday night would have subpoenaed four officials including Bolton, Mulvaney, Mulvaney's adviser Robert Blair and Michael Duffey, an Office of Management and Budget (OMB) official.

It also would have compelled the White House, OMB, Defense Department and State Department to hand over documents related to Trump's decision to delay $391 million in aid to Ukraine.

The Senate tabled that measure, effectively pigeonholing it, in a party-line vote.

The second would have specifically subpoenaed only Bolton. The former national security adviser alleges, in a forthcoming memoir, that Trump directly tied the Ukraine aid to the country helping with investigations into Democrats, including the Bidens.

The Senate voted 51-49 to table that proposal, with Sens. Susan Collins Susan Margaret CollinsThe Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally Gideon leads Collins by 12 points in Maine Senate race: poll Senate leaders quash talk of rank-and-file COVID-19 deal MORE (R-Maine) and Mitt Romney Willard (Mitt) Mitt RomneyThe Memo: Warning signs flash for Trump on debates GOP votes to authorize subpoenas, depositions in Obama-era probe Overnight Defense: Trump hosts Israel, UAE, Bahrain for historic signing l Air Force reveals it secretly built and flew new fighter jet l Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' MORE (R-Utah) supporting the Democratic amendment.

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The two measures were offered as amendments to a resolution from Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll The Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally MORE (R-Ky.) that outlines how the Senate ends Trump's impeachment trial.

Under a deal struck by Republicans, the Senate is expected to pass the resolution Friday. The impeachment trial will then adjourn until Monday when both House managers and Trump's legal team will get two hours each to make their closing arguments.

The final votes of the impeachment trial will occur on Wednesday under the GOP deal.

Democrats are expected to vote in lockstep against the resolution that sets up the end of the trial after they failed to win over four GOP senators to support their request for documents.