John Bolton

Updated at 1:20 a.m. ET

Democrats are pressing the Senate to call former national security adviser John Bolton to testify in President Trump's impeachment trial following a new report that House impeachment managers describe as "explosive."

Updated at 4:57 p.m. ET

President Trump has fired national security adviser John Bolton, the lifelong proponent of American hard power, after months of division between the men over the direction of foreign and national security policy.

Trump announced the news Tuesday on Twitter.