U.S. Sen. Susan Collins of Maine has joined a small group of Republican colleagues in stating opposition to President Donald Trump’s Friday move to commute the prison sentence of longtime friend and political adviser Roger Stone.Stone, a self-proclaimed “dirty trickster” whose political career dates back to the 1972 presidential campaign of Richard Nixon, was sentenced in February to more than three years in prison for lying to Congress, witness tampering and obstructing a congressional investigation into whether the Trump campaign colluded with Russia during the 2016 election. Stone was supposed to report to federal prison by Tuesday, but Trump commuted his sentence on Friday as the White House criticized the handling of Stone’s case.