bob dole from the venice institute s of the study of the history of the resistance and contemporary society thank you so much for joining us here on. now donald trump is facing the biggest challenge yet of his presidency with potentially explosive public impeachment hearings due to start later today lawmakers will question 2 diplomats on whether trump sought hugh crane s help for his 2020 reelection campaign democrats are seeking to prove that trump abused his office by threatening to withhold millions of dollars in aid to ukraine unless its government investigated the son of his chief political rival joe biden trump has called the process of scam democrat leaders say significant and serious. and with us here in studio erwin collyer u.s. analyst and professor at bard college berlin erwin thank you for joining us here this is a moment a lot of democrats we could should say have been waiting for the 1st hearings will start into this proceeding how important how impactful is this moment f