Multiple senators have taken to drinking milk on the Senate floor this week during the chamber's impeachment trial.

“It’s true, I had some milk with my chocolate,” Sen. Tom CottonThomas (Tom) Bryant CottonAsian caucus urges fellow lawmakers not to 'perpetuate racist stereotypes' amid coronavirus fears Overnight Defense: More closures possible at US bases in Europe as coronavirus spreads | Pompeo says Afghan 'reduction in violence is working' | Man accused of trying to blow up vehicle at Pentagon Top general: More closures at US bases in Europe possible as coronavirus spreads MORE (R-Ark.) tweeted Wednesday evening.

“I guess I could’ve added vodka & had a White Russian (minus the Kahlua). But @RepAdamSchiff probably would’ve accused me of collusion,” he quipped.

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An aide to Sen. Ted CruzRafael (Ted) Edward CruzSteyer calls for Senate term limits to pass gun control legislation Cruz targets California governor over housing 'prescriptions' This week: House to vote on legislation to make lynching a federal hate crime MORE confirmed that the Texas Republican also had a glass of milk late into proceedings Tuesday night, when senators were in the chamber until nearly 2 a.m. voting on the rules for the trial.

The aide, deputy chief of staff Sam Cooper, said the Senate cloakroom will keep the beverage cold for senators.

During the trial, senators are required to sit quietly at their desks, refrain from talking and not use electronic devices while the impeachment articles are debated.

Senators spend most of the time in their seats but are allowed to get up to go to the restroom and the cloakroom, where snacks are stored for the members.

The Cut reported that staff in the Republican and Democratic cloakrooms have in recent years allowed only water on the Senate floor.

But a former Senate parliamentarian noted to CNN that a quasi-rule started years ago allowed senators suffering from ulcers to drink milk in addition to water.

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“It was thought to be a treatment for peptic ulcer disease in the '50s, and there was no medicines for peptic ulcer disease, but people would drink milk. And so the senators were allowed to drink milk because they had ulcers,” Sen. Bill CassidyWilliam (Bill) Morgan CassidyThe Hill's Morning Report — AG Barr, GOP senators try to rein Trump in Overnight Health Care: Nevada union won't endorse before caucuses after 'Medicare for All' scrap | McConnell tees up votes on two abortion bills | CDC confirms 15th US coronavirus case Overnight Defense: Senate votes to rein in Trump war powers on Iran | Pentagon shifting .8B to border wall | US, Taliban negotiate seven-day 'reduction in violence' MORE (R-La.) told NBC News.

Multiple senators have used the renewed attention to chamber process for the impeachment trial to make light of any potential rules surrounding beverages.

"There's only two drinks allowed on the Senate floor: milk and water. That must come from a Wisconsin senator, right?" Sen. Ron JohnsonRonald (Ron) Harold JohnsonCongress eyes killing controversial surveillance program Whistleblower retaliation: Stop confusing unlawful attacks with politics Congress looks to strengthen hand in State Department following impeachment MORE (R-Wis.) joked.

The Wall Street Journal reported that there is no official rule that stops senators from drinking beverages other than milk on the Senate floor, with the Senate historian noting "anecdotal evidence" of lawmakers drinking other beverages in years past, such as eggnog and orange juice.