Senate Majority Leader Harry ReidHarry Mason ReidWATCH: There is no Trump-Russia collusion and the media should stop pushing this The demise of debate in Congress ‘North by Northwest,’ the Carter Page remake MORE (D-Nev.) on Tuesday blocked Sen. Rand PaulRandal (Rand) Howard PaulDem wins Kentucky state House seat in district Trump won by 49 points GOP's tax reform bait-and-switch will widen inequality Pentagon budget euphoria could be short-lived 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 Stabenow10 Senate Democrats are up for reelection in Trump country At least Alzheimer’s research is bringing Washington together Senate Dems block crackdown on sanctuary cities MORE (D-Mich.) and Pat RobertsCharles (Pat) Patrick RobertsOvernight Finance: Lawmakers, Treasury look to close tax law loopholes | Trump says he backs gas tax hike | Markets rise despite higher inflation | Fannie Mae asks for .7B Senators working on fix to agriculture provision in GOP tax law Trump budget would slash crop insurance funds for farmers 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 ShaheenOvernight Defense: VA chief won't resign | Dem wants probe into VA hacking claim | Trump official denies plan for 'bloody nose' N. Korea strike | General '100 percent' confident in US missile defense Trump official denies US planning 'bloody nose' strike on North Korea House Oversight Committee opens probe into sexual abuse of gymnasts 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 LeeThe 14 GOP senators who voted against Trump’s immigration framework Prison sentencing bill advances over Sessions objections Grassley ‘incensed’ by Sessions criticism of proposed sentencing reform legislation MORE (R-Utah), the amendments on food stamps by Paul, the Shaheen amendment, and two amendments by Sens. Tom CoburnThomas (Tom) Allen CoburnPaul Ryan should realize that federal earmarks are the currency of cronyism Republicans in Congress shouldn't try to bring back earmarks Republicans should know reviving earmarks is a political nightmare MORE (R-Okla.) and Maria CantwellMaria Elaine CantwellDemocrats request info on 'repeated environmental concerns' at Ohio pipeline Booker to stop accepting donations from corporate PACs Gillibrand vows to refuse donations from corporate PACs 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.