"We will not fund states that allow anarchy," she told reporters.
The federal government remains closed amid a bitter impasse on Capitol Hill over competing congressional spending bills.
President Donald Trump and Republicans have cast blame for the shutdown on Democrats' health care demands, while Democrats insist Republicans need to negotiate.
The Trump administration has threatened mass layoffs of some federal workers during the shutdown.
President Donald Trump welcomed Israeli Prime Minister Benjamin Netanyahu to the White House on Monday, where the two will discuss the ongoing war in the Gaza Strip.
While standing next to Netanyahu, Trump told reporters he is "very confident" there will soon be peace in Gaza.
The two leaders shook hands and waved to cameras before walking into the White House.
Before President Donald Trump meets with bipartisan congressional leadership on Monday to avert a possible government shutdown, House Minority Leader Hakeem Jeffries said Democrats are "determined to turn things around" and that their position "will continue to be clear."
He told reporters Democrats are heading into the meeting to have a "good faith negotiation" about "landing the plane that avoids a government shutdown, but does not continue the Republican assault on the health care of the American people."
One of the main points of contention between Republicans and Democrats is the impending expiration of some of the Affordable Care Act's tax credits, which Democrats are fighting to extend.
Jeffries said he will see whether Trump is "interested in protecting the health care of the American people."
"Enough with the games that Republicans have been playing. No one can trust their word on health care," Jeffries said.
White House press secretary Karoline Leavitt said they are "very close" to all sides agreeing to a comprehensive plan to end the war in Gaza. The comments come as Israeli Prime Minister Benjamin Netanyahu is set to visit the White House on Monday, during which he and President Donald Trump are expected to discuss the proposed deal.
"As you know, the president has been working tirelessly on this effort to bring this war in Gaza and to bring this conflict in the Middle East to an end. He wants to see all of the hostages released," Leavitt told reporters on Monday.
Leavitt said that U.S. special envoy to the Middle East Steve Witkoff "sent a very detailed 21-point plan to both sides" and that Trump "expects both sides to agree."
"The president knows and believes that this is as good of a plan as these sides are going to see, and that's why it's 21 points," Leavitt said.
-ABC News' Michelle Stoddart
White House press secretary Karoline Leavitt said that there's "nothing to negotiate" ahead of President Donald Trump's meeting with bipartisan congressional leadership on Monday as the administration is lobbying heavily for lawmakers to pass a clean continuing resolution to avoid a government shutdown.
"Our message and what we want out of this is very simple. The president wants to keep the government open. He wants to keep the government funded. There is zero good reason for Democrats to vote against this clean continuing resolution. The president is giving Democrats one last chance to be reasonable today," Leavitt said on Monday.
When asked by reporters whether Trump was planning to negotiate with leadership, Leavitt said there's "nothing to negotiate."
During an appearance on Fox News, Leavitt said that passing a clean continuing resolution is the "reasonable" thing to do and indicated that Trump will send that message to the Democrats at the White House on Monday.
-ABC News' Michelle Stoddart
