Trump news – live: US nuclear arsenal now "in tippy-top shape" says president when asked about responding to Iran: 'We should all pray we don't have to use them'

Donald Trump has defended himself on Twitter as his administration faces an extraordinary showdown with Congress after acting national intelligence director Joseph Maguire withheld a whistleblower’s complaint understood to concern a private conversation between the president and a foreign leader, despite its being classified a matter of “urgent concern”.

The House Intelligence Committee has not ruled out going to court to force Mr Maguire’s hand, according to the panel’s chairman Adam Schiff, as The Washington Post and New York Times report at least part of the mystery complaint involves Ukraine.

The president’s former secretary of state Rex Tillerson has meanwhile told Harvard University that the administration “got played” by Israeli prime minister Benjamin Netanyahu, whom he described as “a bit Machiavellian”.

Please allow a moment for our liveblog to load