President Donald Trump lit into Democrats — and House Speaker Nancy Pelosi in particular — in a Sunday tweetstorm in which he appeared to threaten to increase deportations of undocumented immigrants living in the United States and defended his proposal to end the partial government shutdown.

That offer, which Trump presented Saturday in a White House address, included giving about 1 million immigrants a three-year protection from deportation in exchange for $5.7 billion in funding for a wall along the U.S. southern border. Those immigrants include 700,000 who were brought to the country illegally as children and remain protected by the Deferred Action for Childhood Arrivals (DACA) program and 300,000 who fled their countries and are facing the expiration of their "temporary protected status."

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While Republicans praised the proposal and Senate Majority Leader Mitch McConnell pledged to bring it before the full Senate for a vote this week, Democrats panned the deal because it did not ensure permanent protections for those two vulnerable populations and funded a border wall they say is unnecessary. Additionally, some on the far-right complained that the deal amounted to "amnesty" for those 1 million immigrants.

No, Amnesty is not a part of my offer. It is a 3 year extension of DACA. Amnesty will be used only on a much bigger deal, whether on immigration or something else. Likewise there will be no big push to remove the 11,000,000 plus people who are here illegally-but be careful Nancy! — Donald J. Trump (@realDonaldTrump) January 20, 2019

Nancy Pelosi and some of the Democrats turned down my offer yesterday before I even got up to speak. They don’t see crime & drugs, they only see 2020 - which they are not going to win. Best economy! They should do the right thing for the Country & allow people to go back to work. — Donald J. Trump (@realDonaldTrump) January 20, 2019

Nancy Pelosi has behaved so irrationally & has gone so far to the left that she has now officially become a Radical Democrat. She is so petrified of the “lefties” in her party that she has lost control...And by the way, clean up the streets in San Francisco, they are disgusting! — Donald J. Trump (@realDonaldTrump) January 20, 2019

Pelosi said in a Saturday statement that the proposal was "a compilation of several previously rejected initiatives, each of which is unacceptable and in total do not represent a good faith effort to restore certainty to people’s lives."

"It is unlikely that any one of these provisions alone would pass the House, and taken together, they are a nonstarter," she said. "For one thing, this proposal does not include the permanent solution for the Dreamers and TPS recipients that our country needs and supports."

Nearly 800,000 federal workers are affected by the partial government shutdown, which has gone on for nearly a month and is the longest in U.S. history, with many working without pay or furloughed from their jobs. Federal contractors, not included in that number, are losing about $200 million a day.

Trump also tweeted about his upcoming State of the Union address, which Pelosi suggested he delay or submit in writing on its originally agreed-upon date next week because of security concerns related to the partial government shutdown.

After Pelosi sent Trump a letter last week urging the delay, the president pulled the plug on a military plane that was set to take her and other members of Congress to visit troops in Afghanistan. Trump said lawmakers should remain in Washington in order to negotiate an end to the government shutdown.

On Sunday morning, Trump wrote, "Nancy, I am still thinking about the State of the Union speech, there are so many options — including doing it as per your written offer (made during the Shutdown, security is no problem), and my written acceptance. While a contract is a contract, I’ll get back to you soon!"