The Donald Trump impeachment trial in the Senate is being questioned for its validity, if the Senate GOP won’t allow new witnesses, according to legal expert and MSNBC analyst Benjamin Wittes. Wittes tells Joy Reid, "People in states with these senators... need to think about whether they feel okay about [them proudly saying] it's time to proceed to a fateful decision on a national security matter with ignorance." Plus: Donald Trump’s actions have been called wrong by not impeachable by many in the GOP, but will Republicans hold the president accountable for his misdeeds, even if they don’t find him guilty in the Senate impeachment trial? Joy Reid and her panel discuss. Plus: Rep. Deb Haaland joins AM JOY telling people that Elizabeth Warren, who she endorses for the 2020 Democratic presidential nomination, "has been an ally of Indian Country for a long time." All this and more as Joy Reid broadcasts a special Saturday edition AM JOY from Iowa in anticipation of the Iowa Caucuses.