Senate Majority Leader Harry ReidHarry Mason ReidBiden's first 100 days is stylistic 'antithesis' of Trump The Memo: Washington's fake debate on 'bipartisanship' The Hill's Morning Report - Presented by Tax March - CDC in limbo on J&J vax verdict; Rep. Brady retiring MORE (D-Nev.) on Tuesday blocked Sen. Rand PaulRandal (Rand) Howard PaulTim Scott sparks buzz in crowded field of White House hopefuls Sherrod Brown calls Rand Paul 'kind of a lunatic' for not wearing mask Overnight Health Care: WHO-backed Covax gets a boost from Moderna MORE (R-Ky.) from attaching an amendment to the farm bill that would withhold U.S. aid to Pakistan.

Reid asked for unanimous consent Tuesday to consider a batch of five amendments to the farm bill, the Agriculture Reform, Food and Jobs Act of 2012 (S.3240), but Paul objected, arguing that his amendment on withholding aid to Pakistan should also be included. 

In response, Reid performed a procedural move called “filling the tree,” or taking up all the amendment space, to keep Paul's amendment from being considered.

The amendment would have defunded U.S. aid to Pakistan until the country frees an imprisoned doctor who helped the CIA find Osama bin Laden.

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"I have an amendment that's very important," Paul said. "It's not germane, but that doesn't mean it's not important. It's very important that we send Pakistan a signal that we are not willing to send a welfare check when they're holding in prison a political prisoner who helped us get bin Laden. This amendment is of the utmost urgency — would only require 15 minutes of the Senate's time." 

Reid said the farm bill is not the place for dealing with Pakistan and urged Paul to work with him on pressuring the country through other legislation.

Reid said the Senate is working on a bill “that just does not allow something like that to come forward."

"I would like to work with him in the future, and I'm sure a number of other senators would to focus on our relations with Pakistan," Reid said, referring to Paul. "So, I would say to my friend that he doesn't stand alone in his concern, but there has to be a time and place for everything, and hopefully we can have a full debate on Pakistan in the near future."

By filling the tree, Reid blocked Paul or other senators from attaching amendments to the farm bill. Senators will have to come to an agreement on amendments or Reid will have to file cloture in order to attach more amendments to the bill. 

Now, the Senate is set to hold two symbolic votes on Wednesday on two matters in the farm bill, one on food stamps and one on a U.S. sugar quota. Sens. Debbie StabenowDeborah (Debbie) Ann StabenowThe Hill's Morning Report - Presented by Emergent BioSolutions - House GOP drama intensifies; BIden sets new vax goal Overnight Health Care: Biden sets goal of at least one shot to 70 percent of adults by July 4 | White House to shift how it distributes unallocated vaccines to states The Hill's Morning Report - Presented by Emergent BioSolutions - Can Cheney defy the odds and survive again? MORE (D-Mich.) and Pat RobertsCharles (Pat) Patrick RobertsSenate GOP faces retirement brain drain Roy Blunt won't run for Senate seat in 2022 Lobbying world MORE (R-Kan.), the co-sponsors of the farm bill, said that they would still try to find a "global agreement" on amendments to the farm bill.

Specifically, senators will vote to table the two amendments on Wednesday. One, by Sen. Jeanne ShaheenCynthia (Jeanne) Jeanne ShaheenBowser on Manchin's DC statehood stance: He's 'not right' If Taliban regains power, they would roll back rights for women: US intelligence Manchin says he doesn't support DC statehood, election reform bills MORE (D-N.H.) lowers the loan rate for producers of sugar beet crops. The other, by Paul, replaces the federal food stamp program with a state block grant system.

Reid said he had "not given up hope" for reaching a "universal agreement" on the more than 100 farm bill amendments senators had already introduced for consideration. 

If the chamber does not reach an agreement on which amendments to consider, the farm bill could stall despite strong bipartisan support.

The five original amendments Reid offered before Paul objected were a motion to recommit by Sen. Mike LeeMichael (Mike) Shumway LeeRepublicans urge probe into Amazon government cloud-computing bid: report Allowing a racist slur against Tim Scott to trend confirms social media's activist bias Senate passes bipartisan B water infrastructure bill MORE (R-Utah), the amendments on food stamps by Paul, the Shaheen amendment, and two amendments by Sens. Tom CoburnThomas (Tom) Allen CoburnWasteful 'Endless Frontiers Act' won't counter China's rising influence Congress brings back corrupt, costly, and inequitably earmarks Conservative group escalates earmarks war by infiltrating trainings MORE (R-Okla.) and Maria CantwellMaria Elaine CantwellWill Biden's NASA win the space race with China? Bill Nelson is a born-again supporter of commercial space at NASA Biden looks to bolster long-term research and development MORE (D-Wash.). The texts for the Coburn and Cantwell amendments were not immediately available.

—Erik Wasson contributed reporting.

This story was updated at 7:23 p.m.