Senate Majority Leader Harry ReidHarry Mason ReidTrump weighs in on UFOs in Stephanopoulos interview Trump weighs in on UFOs in Stephanopoulos interview Impeachment will reelect Trump MORE (D-Nev.) on Tuesday blocked Sen. Rand PaulRandal (Rand) Howard PaulOvernight Defense: Pompeo blames Iran for oil tanker attacks | House panel approves 3B defense bill | Trump shares designs for red, white and blue Air Force One Senate rejects effort to block Trump's Qatar, Bahrain arms sales Senate rejects effort to block Trump's Qatar, Bahrain arms sales 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 Stabenow It's time to let Medicare to negotiate drug prices Trump judicial nominee says he withdrew over 'gross mischaracterizations' of record Trump judicial nominee says he withdrew over 'gross mischaracterizations' of record MORE (D-Mich.) and Pat RobertsCharles (Pat) Patrick RobertsEPA exempts farms from reporting pollution tied to animal waste EPA exempts farms from reporting pollution tied to animal waste Conservatives spark threat of bloody GOP primaries 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 ShaheenDesign leaks for Harriet Tubman bill after Mnuchin announces delay Design leaks for Harriet Tubman bill after Mnuchin announces delay Bipartisan senators push new bill to improve foreign lobbying disclosures 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 LeeHillicon Valley: GOP senator wants one agency to run tech probes | Huawei expects to lose B in sales from US ban | Self-driving car bill faces tough road ahead | Elon Musk tweets that he 'deleted' his Twitter account Hillicon Valley: GOP senator wants one agency to run tech probes | Huawei expects to lose B in sales from US ban | Self-driving car bill faces tough road ahead | Elon Musk tweets that he 'deleted' his Twitter account On The Money: Democrats move funding bills as budget caps deal remains elusive | Companies line up to weigh in on 0B China tariffs | Trudeau to talk trade with Pelosi, McConnell MORE (R-Utah), the amendments on food stamps by Paul, the Shaheen amendment, and two amendments by Sens. Tom CoburnThomas (Tom) Allen CoburnThe Hill's Morning Report — Presented by PhRMA — Worries grow about political violence as midterms approach President Trump’s war on federal waste American patients face too many hurdles in regard to health-care access MORE (R-Okla.) and Maria CantwellMaria Elaine CantwellHillicon Valley: Democratic state AGs sue to block T-Mobile-Sprint merger | House kicks off tech antitrust probe | Maine law shakes up privacy debate | Senators ask McConnell to bring net neutrality to a vote Hillicon Valley: Democratic state AGs sue to block T-Mobile-Sprint merger | House kicks off tech antitrust probe | Maine law shakes up privacy debate | Senators ask McConnell to bring net neutrality to a vote Senators call on McConnell to bring net neutrality rules to a vote 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.