Senate Majority Leader Harry ReidHarry Mason ReidThe Memo: Democrats confront prospect of long primary Bottom Line Lobbying world MORE (D-Nev.) on Tuesday blocked Sen. Rand PaulRandal (Rand) Howard PaulGOP divided over impeachment trial strategy Trump: 'Everybody knows who the whistleblower is' Johnson opens door to subpoenaing whistleblower, Schiff, Bidens 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 StabenowCentrist Democrats seize on state election wins to rail against Warren's agenda Cash surge puts more Senate races in play Poll shows Sen. Gary Peters with slim lead over GOP rival in Michigan MORE (D-Mich.) and Pat RobertsCharles (Pat) Patrick RobertsEleven GOP senators sign open letter backing Sessions's comeback bid Pressure builds on Pompeo as impeachment inquiry charges ahead GOP lawmakers fear Trump becoming too consumed by impeachment fight 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 ShaheenOn The Money: US paid record .1B in tariffs in September | Dems ramp up oversight of 'opportunity zones' | Judge hints at letting House lawsuit over Trump tax returns proceed Overnight Energy: EPA watchdog slams agency chief after deputy fails to cooperate in probe | Justices wrestle with reach of Clean Water Act | Bipartisan Senate climate caucus grows Overnight Defense: Trump, Erdogan confirm White House meeting | Public impeachment hearings set for next week | Top defense appropriator retiring 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 LeeGOP divided over impeachment trial strategy Hillicon Valley: Amazon to challenge Pentagon cloud contract in court | State antitrust investigation into Google expands | Intel agencies no longer collecting location data without warrant Senators introduce bipartisan bill restricting police use of facial recognition tech 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 CantwellMicrosoft embraces California law, shaking up privacy debate Senators introduce cybersecurity workforce expansion bill Boeing chief faces anger over 737 crashes at hearing 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.