President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE on Saturday invited Democratic leaders to call him to discuss crafting new immigration laws, claiming Democrats are blocking new proposals.

"If the Democrats would stop being obstructionists and come together, we could write up and agree to new immigration laws in less than one hour," Trump tweeted.

The president accused Democrats of causing "needless pain and suffering" while pointing to "horrors taking place on the Border." He did not elaborate on what issues he was referring to.

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"Chuck & Nancy, call me!" Trump wrote, referring to Senate Minority Leader Charles Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE (D-N.Y.) and House Minority Leader Nancy Pelosi Nancy PelosiPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Trump signs largely symbolic pre-existing conditions order amid lawsuit MORE (D-Calif.).

If the Democrats would stop being obstructionists and come together, we could write up and agree to new immigration laws in less than one hour. Look at the needless pain and suffering that they are causing. Look at the horrors taking place on the Border. Chuck & Nancy, call me! — Donald J. Trump (@realDonaldTrump) October 20, 2018

Schumer and Pelosi issued a joint statement on Saturday afternoon pushing back on Trump's tweet while accusing Republicans of "making a mess" of the U.S. health-care system.

The Trump administration is currently arguing in court that ObamaCare’s pre-existing condition protections should be struck down, and the Democratic leaders said their members "will not be diverted" away from discussing health care.

"The president is desperate to change the subject from health care to immigration because he knows that health care is the number one issue Americans care about," Pelosi and Schumer said in the statement.

"Mitch McConnell Addison (Mitch) Mitchell McConnellTrump 'no longer angry' at Romney because of Supreme Court stance On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline The Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power MORE, Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE, and Republicans in Washington are making a mess of our health care system, causing premiums to increase and care to decrease."

Conservatives have grown increasingly worried that Trump and GOP leaders will strike a scaled-down immigration deal with Democrats in the lame-duck session if Democrats win control of the House next month.

Some Republicans worry that Trump will be eager to offer protections for hundreds of thousands of young immigrants known as Dreamers in exchange for the requested $25 billion for his border wall.

“[The wall] is the biggest symbol of Trump. It’s something he really, really wants,” Chris Chmielenski, deputy director for NumbersUSA, told The Hill this week. “And that’s our biggest fear, is that he’s going to give up amnesty to get a border wall.”

Meanwhile, Trump has escalated his rhetoric on immigration in recent days while seeking to rally GOP voters in the final weeks heading into the November midterm elections.

The president has repeatedly seized on a thousands-strong caravan of migrants pushing up through Central America toward the United States, demanding that Mexico stop the caravan.

On Thursday, Trump blamed Democratic policies for facilitating the caravan and doubled down on his promise to send the military to the U.S.-Mexico border to prevent the group from entering.

Updated: 4:35 p.m.