Key Republican senator opposes fresh testimony; defense attorney Dershowitz causes controversy by suggesting president is immune if he believes he acted in national interest

Prominent jurist argues that, even if proven, the quid pro quo charge at the heart of the Ukraine scandal cannot be grounds for impeachment

Revelations in forthcoming book by former national security adviser undercut key defense argument, with some in GOP now prepared to allow fresh testimonies

Nadler is one of seven House members serving as a manager, or prosecutor, in Trump's Senate trial

Former national security adviser wrote that US president wanted to withhold military aid from Ukraine until it helped with an investigations into his Democratic rival

Sen. Adam Schiff, House head of prosecution team, tells lawmakers to follow example of those who risked careers to report president's actions -- but GOP senators seem unmoved

Mohammad Shtayyeh says upcoming offer contravenes international law, is aimed at protecting US president from impeachment and Netanyahu from indictment

President tweets that lead prosecutor in impeachment trial 'has not paid the price, yet, for what he has done to our Country!'

New York Times says former national security adviser's description of exchange with Trump appears in drafts of his forthcoming book submitted to White House ahead of publication

Bombshell footage of fundraising dinner also includes Lev Parnas and Igor Fruman giving president a gift in which rabbis in Ukraine and Israel compare him to the messiah