Senate Majority Leader Harry ReidHarry ReidChris Murphy’s profile rises with gun tragedies Republicans are headed for a disappointing end to their year in power Obama's HHS secretary could testify in Menendez trial MORE (D-Nev.) on Tuesday blocked Sen. Rand PaulRandal (Rand) Howard PaulHouse bill set to reignite debate on warrantless surveillance Authorizing military force is necessary, but insufficient GOP feuds with outside group over analysis of tax framework 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 StabenowDems plan to make gun control an issue in Nevada Red-state Dems need more from Trump before tax embrace Stabenow: ‘Kid Rock might actually win the Republican primary’ MORE (D-Mich.) and Pat RobertsCharles (Pat) Patrick RobertsThe Hill's Whip List: Republicans try again on ObamaCare repeal No. 2 Senate Republican backs McConnell in Trump fight Overnight Healthcare: McConnell warns Senate not to block repeal debate | Insurers knock Cruz proposal | WH tries to discredit CBO | Lawmakers propose .1B NIH funding boost 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 ShaheenHomeland Security searching some social media doesn't violate privacy The feds shouldn't blackball Kaspersky without public evidence Week ahead: Crunch time for defense bill’s cyber reforms | Equifax under scrutiny 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 LeeWhatever you think the Alabama special election means, you’re probably wrong How the effort to replace ObamaCare failed Overnight Regulation: Trump temporarily lifts Jones Act for Puerto Rico | Bill would exempt some banks from Dodd-Frank | Senators unveil driverless car bill MORE (R-Utah), the amendments on food stamps by Paul, the Shaheen amendment, and two amendments by Sens. Tom CoburnTom Coburn-trillion debt puts US fiscal house on very shaky ground Al Franken: 'I make fun of the people who deserved it' The more complex the tax code, the more the wealthy benefit MORE (R-Okla.) and Maria CantwellMaria Elaine CantwellUse tax reform to strengthen what’s working: The low-income housing tax credit Senate energy bill is misguided gift to Trump’s dirty fossil fuel agenda Help states solve their housing problems with the Affordable Housing Credit Improvement Act 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.