House Speaker Nancy Pelosi (D-Calif.) has given the White House a 48-hour deadline to reconcile differences in stimulus negotiations "to demonstrate that the administration is serious about reaching a bipartisan agreement," a top Pelosi aide tweeted Sunday night.

The state of play: Pelosi and Treasury Secretary Steven Mnuchin spoke for over an hour Saturday night, and the discussions yielded "some encouraging news on testing," deputy chief of staff Drew Hammill said. But the pair still had differences on a plan for testing and contact tracing and "measures to address the virus’ disproportionate impact on communities of color."

• Hammill had tweeted on Thursday Mnuchin had agreed to accept the Democrats' language on a national testing plan with "minor" edits after an hourlong discussions.
• President Trump has been eager for a pre-election stimulus boost to the economy and has encouraged Mnuchin to go further than his current $1.8 trillion proposal — even though it has virtually no chance of passing the Senate.

Yes, but: The House speaker did not say what would happen if the parties didn't reach a deal by the deadline she imposed.

What they're saying: "The Speaker and Secretary Mnuchin spoke at 7:40 p.m. by phone tonight for just over an hour. While there was some encouraging news on testing, there remains work to do to ensure there is a comprehensive testing plan that includes contact tracing and additional measures to address the virus’ disproportionate impact on communities of color," Hammill wrote in a series of tweets.

• "There remains an array of additional differences as we go provision by provision that must be addressed in a comprehensive manner in the next 48 hours."
• "Decisions must be made by the White House in order to demonstrate that the Administration is serious about reaching a bipartisan agreement that provides for Americans with the greatest needs during the pandemic."

The other side: Senate Majority Leader Mitch McConnell has said he would not put a potential $1.8 trillion+ deal struck by Democrats and the Trump administration on the Senate floor. Instead, the Senate will vote next week on a Paycheck Protection Program extension and a targeted $500 billion relief package.

What to watch: Pelosi and Mnuchin are set to continue talks on Monday, per the Wall Street Journal.