WASHINGTON, Aug 1 (Reuters) - Donald Trump was indicted on Tuesday for his wide-ranging attempts to overturn the 2020 election, the third time in four months that the former U.S. president has been criminally charged even as he campaigns to regain the presidency next year. The four-count, 45-page indictment charges Republican Trump with conspiring to defraud the U.S. by preventing Congress from certifying Democrat Joe Biden's victory and to deprive voters of their right to a fair election. Then-President Trump pushed fraud claims he knew to be untrue, pressured state and federal officials - including Vice President Mike Pence -...