In a setback to US President Donald Trump, a judge ruled yesterday that former White House counsel Don McGahn must comply with a congressional subpoena as lawmakers pursue an impeachment inquiry. The court rejected the administration's assertion of immunity for such officials, saying no one is above the law.<br />''<br />''U.S. District Judge Ketanji Brown Jackson's ruling concerns only McGahn's testimony to a House of Representatives committee. But legal experts say, it could give other former and current officials, like his former national security adviser John Bolton, a legal basis for cooperating with the Democratic-led House impeachment inquiry.<br />''<span style="color: #222222;"><br />''McGahn, who left his post in October 2018, last May defied a subpoena from the Democratic-led House of Representatives Judiciary Committee for testimony into Russian interference in the 2016 US election. The committee sued McGahn in August to try to enforce the subpoena.</span><br />