The Trump administration is struggling to stem the fallout from revelations that top national security officials discussed sensitive attack plans over a messaging app and mistakenly added a journalist to the chain.

The White House said the information shared through the publicly available Signal app with Jeffrey Goldberg, editor-in-chief of The Atlantic magazine, was not classified, an assertion that Democrats said strains credulity considering that it detailed plans for an upcoming attack on Yemen's Houthis.

China poses the top threat to American interests and security globally and is making "steady" progress towards having the ability to seize the self-ruled island of Taiwan, an annual US intelligence report warned Tuesday.

In a matter of days, U.S. President Donald Trump has extended a hand to Iran and bombed Tehran's allies in Yemen. His administration has both demanded that Iran dismantle its nuclear program and offered more flexibility.

U.S. President Donald Trump has downplayed the texting of sensitive plans for a military strike against Yemen's Houthis this month to a group chat that included a journalist, saying it was "the only glitch in two months" of his administration as Democratic lawmakers heaped criticism on the administration for handling highly sensitive information carelessly.

Trump told NBC News that the lapse "turned out not to be a serious one," and expressed his continued support for national security adviser Mike Waltz.

The revelation that U.S. President Donald Trump's most senior national security officials posted the specifics of a military attack to a chat group that included a journalist hours before the attack took place in Yemen has raised many questions.

Among them is whether federal laws were violated, whether classified information was exposed on the commercial messaging app, and whether anyone will face consequences for the leaks.

Top Trump administration officials texted a group chat including a journalist plans for strikes on Yemen's Houthi rebels, the White House said, an extraordinary security breach that shocked Washington's political elite.

U.S. President Donald Trump announced the strikes on March 15, but The Atlantic magazine's editor-in-chief Jeffrey Goldberg wrote on Monday that he had hours of advance notice via the group chat on Signal, which included Defense Secretary Pete Hegseth and Vice President JD Vance.

Denmark's foreign minister on Monday slammed as "inappropriate" a planned visit by a US delegation to Greenland -- a Danish autonomous territory coveted by U.S. President Donald Trump.

A Russian missile attack on a hospital and residential area in Ukraine's northeastern city of Sumy on Monday wounded 28 people, local officials said, as Moscow and Washington held talks in Saudi Arabia on a potential ceasefire.

"Today, the enemy attacked the residential neighbourhood and infrastructure facilities in the city, including children's institutions and a hospital," acting mayor of Sumy Artem Kobzar said, adding "24 adults and four children" were wounded.

As President Donald Trump and billionaire Elon Musk work to overhaul the federal government, they're forcing out thousands of workers with insider knowledge and connections who now need a job.

For Russia, China and other adversaries, the upheaval in Washington as Musk's Department of Government Efficiency guts government agencies presents an unprecedented opportunity to recruit informants, national security and intelligence experts say.

Iran said on Monday it was open to indirect talks with the United States, after President Donald Trump had issued an ultimatum for a new nuclear deal.

"The way is open for indirect negotiations," Foreign Minister Abbas Araghchi said, dismissing the prospect of direct talks with Washington "until there is a change in the other side's approach towards the Islamic republic".