Original sentence: Trump's decision to withdraw was strongly criticized in the U.was backed by many Republicans but was strongly opposed by Democrats
Edited sentence: (This is attributed to a partisan source).This could be mitigated if the other countries contributed as they were supposed to, another reason for Trump withdrawing the U.This is unlikely though, because they are the biggest offenders.Trump's decision to withdraw was strongly criticized by Democrats in the U.was backed by most Republicans but was strongly opposed by Democrats