WASHINGTON — President Donald Trump and congressional leaders announced Monday they had struck a critical debt and budget agreement. The deal amounts to an against-the-odds victory for Washington pragmatists seeking to avoid politically dangerous tumult over the possibility of a government shutdown or first-ever federal default.

The deal, announced by Trump on Twitter and in a statement by Democratic House Speaker Nancy Pelosi and Senate Democratic leader Chuck Schumer, will restore the government’s ability to borrow to pay its bills past next year’s elections and build upon recent large budget gains for both the Pentagon and domestic agencies.

“I am pleased to announce that a deal has been struck,” Trump tweeted, saying there will be no “poison pills” added to follow-up legislation. “This was a real compromise in order to give another big victory to our Great Military and Vets!”

The agreement is on a broad outline for $1.37 trillion in agency spending next year and slightly more in fiscal 2021. It would mean a win for lawmakers eager to return Washington to a more predictable path amid political turmoil and polarization, defense hawks determined to cement big military increases and Democrats seeking to protect domestic programs.

Pelosi and Schumer said the deal “will enhance our national security and invest in middle class priorities that advance the health, financial security and well-being of the American people.”

They claimed credit for winning more than $100 billion worth of spending increases for domestic priorities since Trump took office.

Nobody notched a big win, but both sides view it as better than a protracted battle this fall that probably wouldn’t end up much differently.

However, it also comes as budget deficits are rising to $1 trillion levels — requiring the government to borrow a quarter for every dollar the government spends — despite the thriving economy and three rounds of annual Trump budget proposals promising to crack down on the domestic programs that Pelosi is successfully defending now. It ignores warnings from deficit and debt scolds who say the nation’s fiscal future is unsustainable and will eventually drag down the economy.

“This agreement is a total abdication of fiscal responsibility by Congress and the president,” said Maya MacGuineas, president of the Committee for a Responsible Federal Budget, a Washington advocacy group. “It may end up being the worst budget agreement in our nation’s history, proposed at a time when our fiscal conditions are already precarious.”

A push by the White House and House GOP forces for new offsetting spending cuts was largely jettisoned, though Pelosi, D-Calif., gave assurances about not seeking to use the follow-up spending bills as vehicles for aggressively liberal policy initiatives.

Fights over Trump’s U.S.-Mexico border wall, other immigration-related issues and spending priorities will be rejoined on spending bills this fall that are likely to produce much the same result as current law. The House has passed most of its bills, using far higher levels for domestic spending. Senate measures will follow this fall, with levels reflecting the accord.

At issue are two separate but pressing items on Washington’s must-do agenda: increasing the debt limit to avert a first-ever default on U.S. payments and acting to set overall spending limits and prevent automatic spending cuts from hitting the Pentagon and domestic agencies in January.