In response to the cancellation, Ryan and McConnell issued a joint statement accusing the Democratic leaders of "antics" and finding "new excuses not to meet with the administration to discuss these issues."
White House Press Secretary Sarah Huckabee Sanders said the invitation "still stands, and [Trump] encourages them to put aside their pettiness, stop the political grandstanding, show up and get to work."
Trump's tweet raised the prospect of a potentially disastrous government shutdown.
The purpose of the meeting was to begin urgent negotiations to pass a federal budget and spending plan before the government runs out of funding on Dec. 8. Republicans are insisting that as part of any deal, caps on military spending be lifted. Democrats are expected to use their leverage to demand policy protections for the so-called immigration Dreamers and a reauthorization of the Children's Health Insurance Program.
The trouble with Trump's inability to see "a deal" is that Republicans cannot pass a federal spending bill without Democratic votes in the Senate, where a 60-vote majority will be needed to move the bill forward. In the House, Republicans have needed Democratic votes in recent years to pass spending bills, because the GOP caucus' most conservative members have refused to support the bills.
This gives Democrats far greater leverage in these negotiations than they have on tax reform, for instance, where Republicans can pass a bill with a simple majority in the Senate and near-unanimous support from House Republicans.
Even if a deal is reached at the 11th hour, the prospect of a government shutdown could rattle financial markets. In the event that a shutdown were to occur, the results would likely be disastrous for Republicans heading into the 2018 midterm elections.
The last shutdown, in October 2013, lasted 16 days and cost the economy more than $1 billion a day, according to most estimates.