Defense Secretary Pete Hegseth and other members of the Trump administration are being investigated for their recent use of a Signal app before a military strike on the Houthis in Yemen.

Republican calls to investigate a group chat in which White House national security officials shared sensitive military information has intensified, with Oklahoma Senator James Lankford saying it is "entirely appropriate".

The Pentagon’s inspector general will conduct an investigation of the Signal group chat where Defense Secretary Pete Hegseth and other Trump administration officials discussed details of an impending attack on Houthi militants in Yemen.