The impeachment trial of President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE is keeping some senators from fundraising events ahead of a busy election year.

Senate Republicans, in particular, have had to postpone a few Washington fundraisers because their attendance is required at the trial.

A fundraiser set for Wednesday night for Sen. Dan Sullivan Daniel Scott SullivanHillicon 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 Republican Senators raise concerns over Oracle-TikTok deal Alaska group backing independent candidate appears linked to Democrats MORE (R-Alaska), who is running for reelection this year, was postponed around 9 a.m. Wednesday morning, according to an email obtained by The Hill.

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The "Small Dinner benefiting Alaskans for Dan Sullivan" was scheduled for 6:30 p.m. "Requested Contribution: $1,000 PAC or $500 Personal to Attend, $2,000 PAC or $1,000 Personal to Host," the invite read. The campaign has another dinner for Sullivan set for Jan. 28.

Sen. Mitt Romney Willard (Mitt) Mitt RomneySenate Republicans face tough decision on replacing Ginsburg McConnell says Trump nominee to replace Ginsburg will get Senate vote GOP-led panel to hear from former official who said Burisma was not a factor in US policy MORE’s (R-Utah) PAC also postponed its “Believe in America Kick-off Reception,” set for 5:30 p.m. Wednesday, around 10 a.m., according to an email obtained by The Hill.

The Romney PAC event had suggested donations of $1,000 for PACs and $500 personal contributions.

The National Republican Senatorial Committee PAC was also forced to cancel a fundraiser this week. PAC Director Megan Becker sent an email around 1 p.m. on Tuesday postponing a fundraiser for that evening at 6 p.m. Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE (R-Ky.) and Sen. Todd Young Todd Christopher YoungSenate GOP eyes early exit Why the US should rely more on strategy, not sanctions Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump MORE (R-Ind.) were slated to attend that event.

The scrapped fundraisers highlight how the impeachment trial has scrambled the schedules and campaign plans for many candidates, most notably those Senate Democrats who are running for president.

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The campaign for Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.), who is seeking the Democratic nomination, announced Tuesday that it was canceling a rally in Iowa scheduled for Wednesday because of the trial. But the campaign said that Rep. Alexandria Ocasio-Cortez Alexandria Ocasio-CortezLawmakers fear voter backlash over failure to reach COVID-19 relief deal Why Democrats must confront extreme left wing incitement to violence The Hill Interview: Jerry Brown on climate disasters, COVID-19 and Biden's 'Rooseveltian moment' MORE (D-N.Y.) would attend two events later in the week in the state.

Trump's impeachment trial officially began Tuesday, and senators faced a late night on day one, with the proceedings going through midnight and ending early Wednesday morning. Senators could face more long nights and Saturday sessions. This week, the Democratic House managers have 24 hours over three days to present their case. President Trump's lawyers will be afforded the same amount time.

The Democratic Senatorial Campaign Committee (DSCC) also canceled a fundraising dinner with members of the Democratic caucus in Philadelphia that was set for Thursday.

Updated at 9:56 a.m.