A new poll finds that roughly four times as many Americans who identify as Republican or lean toward the GOP say immigration is a top U.S. problem, compared to Democrats.

Sixteen percent of Republicans in a Gallup survey released Monday say immigration is the biggest problem in America — up from only 9 percent last month and far more than the 4 percent of Democrats who say the same. In the GOP, immigration ties with "government dissatisfaction" as the top-ranked problem.

Among Democrats, government dissatisfaction is by far the front-runner, with 30 percent of respondents listing it. Race relations comes in second among Democrats, with 8 percent.

The poll comes as lawmakers on Capitol Hill struggle to reach a deal on immigration reform as the government heads toward a possible shutdown at the end of the week.

President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE met with Senate lawmakers in the Oval Office last week to discuss immigration, but his remarks in the meeting blew up to be a major controversy after he reportedly described several nations as "shithole countries."

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“Why are we having all these people from shithole countries come here?” Trump reportedly said, referring to immigrants from African countries, Haiti and El Salvador.

Trump has repeatedly accused Democrats of not being serious about making a deal on DACA, which has become a key focus in immigration talks.