Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.) on Friday called it "disappointing" that he is not on the campaign trail in Iowa in the final weeks before the caucuses due to the ongoing impeachment trial.

“Obviously, when we were planning out our schedule, trust me, we were not expecting to be in Washington this week," Sanders said in an interview airing Friday on "CBS Evening News."

"We had set up a number of town meetings all over the state — we usually bring out good crowds — so it is disappointing to me to not be in Iowa talking to the people there,” he added.

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Sanders argued that the time puts him "at a disadvantage," acknowledging that others such as former Vice President Joe Biden Joe BidenMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE are still able to hit the campaign trail in the Hawkeye State.

NEW: 2020 presidential candidate Sen. @BernieSanders (I-VT) tells @NorahODonnell that the Senate impeachment trial, necessitating his presence in Washington, D.C., places him "at a disadvantage" ahead of the Iowa caucuses on Feb. 3; watch more tonight at 6:30 p.m. ET. pic.twitter.com/l8WErwfHpV — CBS Evening News (@CBSEveningNews) January 24, 2020

Sanders is scheduled to attend a rally in Iowa on Saturday night and campaign in the state the next day after being forced to scrap a campaign event earlier this week due to the Senate trial against President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE.

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All 100 senators are required to be in Washington, D.C., during the day for six days a week during the trial, which kicked off in earnest on Tuesday. House impeachment managers making the case for removing Trump from office presented their arguments over the past three days, while White House lawyers are slated to offer their defense of the president starting Saturday and into next week.

Sanders is expected to appear at his rally in Ames on Saturday night alongside 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.) and filmmaker Michael Moore. Ocasio-Cortez, Moore and Rep. Mark Pocan Mark William PocanClark rolls out endorsements in assistant Speaker race Hillicon Valley: Pentagon reaffirms decision to award JEDI contract to Microsoft | Schiff asks officials for briefing on election security threats Democrats explore new ways to resurrect election security briefings MORE (D-Wis.), a co-chairman of the Congressional Progressive Caucus who recently endorsed Sanders, are also slated to appear at a town hall for Sanders in Cedar Falls earlier in the day.

Three of Sanders's opponents in the Democratic primary — Sens. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass), Amy Klobuchar Amy KlobucharThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill EPA delivers win for ethanol industry angered by waivers to refiners It's time for newspapers to stop endorsing presidential candidates MORE (D-Minn.) and Michael Bennet Michael Farrand BennetOVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Senate Democrats demand White House fire controversial head of public lands agency Next crisis, keep people working and give them raises MORE (D-Colo.) — are also sitting through the impeachment trial.

Sanders told reporters last week that he was concerned about missing key time on the campaign trail. When asked on Friday, Sanders said he believes this extra time gives several of his opponents an upper hand.

“Politically, in the last week or so of the campaign? Yeah, I think it does," he said when asked if he thought the trial schedule benefitted Biden.

“He and others, not just Biden, are able to go out, talk to people, that’s really important."