With respect to the debate about whether the impeachment inquiry into Trump should be narrow or broad, I lean strongly towards the latter (in part because I don’t think there’s any real chance of conviction.) But on the merits, the case for impeachment goes well beyond Ukraine. This is a good summary of the potential charges. I especially like the trolling potential of Article II, but I think these two might be the most important:
VI. Profiting From Office
Explanation: Federal employees must follow strict rules to prevent them from being influenced by any financial conflict. Conflict-of-interest rules are less clear for a sitting president because all presidential misconduct will be resolved by either reelection or impeachment. If Trump held any position in the federal government below the presidency, he would have been fired for his obvious conflicts. His violations are so gross and blatant they merit impeachment.
Evidence: (62) He has maintained a private business while holding office, (63) made decisions that influence that business, (64) and accepted payments from parties both domestic and foreign who have an interest in his policies. (65) He has openly signaled that these parties can gain his favor by doing so. (66) He has refused even to disclose his interests, which would at least make public which parties are paying him.
VII. Fomenting Violence
Explanation: One of the unspoken roles of the president is to serve as a symbolic head of state. Presidents have very wide latitude for their political rhetoric, but Trump has violated its bounds, exceeding in his viciousness the rhetoric of Andrew Johnson (who was impeached in part for the same offense).
Evidence: (67) Trump called for locking up his 2016 opponent after the election. (68–71) He has clamored for the deportation of four women of color who are congressional representatives of the opposite party. (72) He has described a wide array of domestic political opponents as treasonous, including the news media. (73–80) On at least eight occasions, he has encouraged his supporters — including members of the armed forces — to attack his political opponents. (“I have the support of the police, the support of the military, the support of the Bikers for Trump — I have the tough people, but they don’t play it tough until they go to a certain point, and then it would be very bad, very bad.”) (81) He has threatened journalists with violence if they fail to produce positive coverage. (“If the media would write correctly and write accurately and write fairly, you’d have a lot less violence in the country.”) (82) There have been 36 criminal cases nationwide in which the defendant invoked Trump’s name in connection with violence; 29 of these cited him as the inspiration for an attack.