The Trump administration sought to put the scandal over its use of the Signal messaging app behind it on Monday, calling it case closed, even as the breach provoked bipartisan criticism and opened up divisions inside the White House.

Although Trump decided not to fire his national security adviser over the Signal group chat, Waltz’s position is tenuous, officials say.

The White House is under fire after top Trump administration officials discussed military plans in a Signal chat that included Jeffrey Goldberg, the editor-in-chief of The Atlantic, according to the original report.