WASHINGTON (Reuters) -Steve Bannon, a former top adviser to Donald Trump, must report to prison by July 1 to serve a four-month sentence for contempt of Congress, a federal judge said on Thursday. The decision means Bannon, a right-wing media firebrand who maintains influence in Trump’s orbit, will likely be behind bars for a critical stretch of the U.S. presidential campaign as former President Trump faces Democratic President Joe Biden in the Nov. 5 election. The order by U.S. District Judge Carl Nichols in Washington came after a federal appeals court last month rejected Bannon’s bid to overturn his conviction for spurning a subpoena from a congressional panel that investigated the Jan. 6, 2021, attack on the U.S. Capitol.