Senate Democrats on Wednesday blocked legislation from the House that would crack down on the resettlement of Syrian and Iraqi refugees in the United States.

The 55-43 vote came after Senate Minority Leader Harry ReidHarry ReidBill O'Reilly: Politics helped kill Kate Steinle, Zarate just pulled the trigger Tax reform is nightmare Déjà vu for Puerto Rico Ex-Obama and Reid staffers: McConnell would pretend to be busy to avoid meeting with Obama MORE (D-Nev.) sought approval of a handful of amendments, including one on Donald TrumpDonald John TrumpHouse Democrat slams Donald Trump Jr. for ‘serious case of amnesia’ after testimony Skier Lindsey Vonn: I don’t want to represent Trump at Olympics Poll: 4 in 10 Republicans think senior Trump advisers had improper dealings with Russia MORE's push to temporarily ban Muslims from entering the country.

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Republicans ripped the attempt to link the bill to the GOP presidential candidate. Senate Majority Whip John CornynJohn CornynMcConnell names Senate GOP tax conferees Air Force makes criminal reporting changes after Texas massacre We need a better pathway for allowing civilians to move guns across state lines MORE (R-Texas) called the effort “ridiculous” and said Democrats were trivializing the refugee issue “by bringing the circus to town on the floor of the Senate.”

"I hate to see the Democratic leader try to trivialize this very important national security debate and discussion by injecting presidential election politics right in the middle of this," Cornyn said.

Democrats fired back, suggesting GOP leaders rejected Reid's deal because they were afraid of taking on their party’s presidential front-runner.

"When we offer them a chance to vote on another statement by Republican presidential nominee Mr. Trump ... they run like scalded cats," Sen. Dick DurbinRichard (Dick) Joseph DurbinDemocrats turn on Al Franken Minnesota's largest newspaper calls on Franken to resign Democratic senator predicts Franken will resign Thursday MORE (D-Ill.) said. 

Sen. Bernie SandersBernard (Bernie) SandersSchumer: Franken should resign Franken resignation could upend Minnesota races Avalanche of Democratic senators say Franken should resign MORE (I-Vt.), who is running for the Democratic presidential nomination, missed the vote, as did Sen. Lindsey GrahamLindsey Olin GrahamGOP and Dems bitterly divided by immigration We are running out of time to protect Dreamers US trade deficit rises on record imports from China MORE (R-S.C.).

The refugee legislation, which passed the House late last year, would "pause" the resettlement of Syrian and Iraqi refugees in the U.S. until the Obama administration certifies that they aren't a national security threat. Sixty votes were needed to move forward.

President Obama has threatened to veto the bill if it reaches his desk.

Speaker Paul RyanPaul Davis RyanMcConnell names Senate GOP tax conferees House Republican: 'I worry about both sides' of the aisle on DACA Overnight Health Care: 3.6M signed up for ObamaCare in first month | Ryan pledges 'entitlement reform' next year | Dems push for more money to fight opioids MORE (R-Wis.) slammed Senate Democrats, calling their decision to block the legislation "irresponsible."

"Our approach balances security and compassion, and it was backed by a veto-proof majority in the House," he said.

Fighting over refugee resettlement has intensified amid rising fears about the Islamic State in Iraq and Syria (ISIS). Some worry the terrorist group could use the program to slip fighters into the U.S. and carry out attacks on American soil like the carnage the group unleashed in Paris last year. 

Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellGOP strategist donates to Alabama Democrat McConnell names Senate GOP tax conferees Brent Budowsky: A plea to Alabama voters MORE (R-Ky.) had suggested that senators shouldn't put a limit on amendments to the refugee legislation and that the onus was on Democrats to allow the votes.

"A better way to go forward would be to go to the bill, have an open amendment process, alternate from side to side. Senators should vote to go to the legislation," McConnell told reporters. 

But Durbin said McConnell's counteroffer wouldn’t guarantee the amendment votes Democrats were seeking.

"Sen. McConnell is a pro and is experienced, and he knows that any single senator could object to going to a roll call vote on any amendment," Durbin said.

Reid called the bill "just another step in the absolute wrong direction, the direction of Donald Trump." 

Republican senators had planned to offer amendments to the bill that would give governors the ability to reject refugees and require the Obama administration to include social media in refugee background checks.

GOP senators were also planning to try to make Democrats take politically sensitive votes.

Sen. Ted CruzRafael (Ted) Edward CruzDebbie Wasserman Schultz marks 10 years as breast cancer survivor Foreign agent registration is no magical shield against Russian propaganda Let Trump be Trump and he'll sail through 2020 MORE (R-Texas), who is running for president, said that he was planning to offer an amendment that would increase jail time for undocumented immigrants who reenter the country illegally. 

Known as "Kate's Law," the legislation is named after Kathryn Steinle, who was shot and killed in San Francisco. The suspect in her slaying is an illegal immigrant who had been deported five times. 

Even if Democrats had allowed Republicans to add the provisions, they could have blocked McConnell from ending debate on the bill.

The House legislation has underscored divisions among Senate Republicans over how to make the refugee resettlement process more secure.  

Sen. Jeff FlakeJeffrey (Jeff) Lane FlakeGOP strategist donates to Alabama Democrat Sasse: RNC help for Roy Moore 'doesn't make any sense' Sasse calls RNC decision to resume support for Moore 'bad' and 'sad' MORE (R-Ariz.) said that while he doesn't support a "pause" of refugee acceptance, he backs moving forward with the legislation so that he could try to amend it.  

"I'm not a fan of this approach," Flake told reporters, adding that he planned to offer amendments to loosen new visa restrictions for dual nationals that were included in last months' government spending bill. 

Some conservative Republicans, on the other hand, argue the refugee bill doesn’t go far enough. 

Sen. Jeff SessionsJefferson (Jeff) Beauregard SessionsGOP strategist donates to Alabama Democrat House passes concealed carry gun bill Rosenstein to testify before House Judiciary Committee next week MORE (R-Ala.) suggested late last year that the House bill would allow Obama to bring in as many refugees as he wants, adding that it "fails to defend" American interests. 

Updated at 5:31 p.m.