Former US president says Russian tactics were 'smart' and the US could replicate them on its border with Mexico

Experts say there simply are not enough skilled threat-hunting teams to identify all government and private-sector systems that may have been attacked

President says he wants an impeachment trial so he can put Democrat Adam Schiff on stand, repeats discounted claim about Ukrainian meddling and says he hardly knows Sondland

Former White House official Fiona Hill tells Congress attacks on Jewish philanthropist are new version of anti-Semitic 'Elders of Zion' libel

In investigation transcripts, Vindman says there was no ambiguity; Hill says Bolton 'immediately stiffened' when EU envoy said he worked on trade for Oval Office welcome