The Supreme Court ruled Friday that Steve Bannon must begin his four-month prison sentence on contempt of Congress charges as his appeal proceeds. 

The one-sentence order, which had no public dissents, keeps in place Monday's deadline for the onetime Trump strategist to report to prison, rejecting Bannon's emergency effort to delay it. 

It makes Bannon the second Trump White House aide to serve prison time in connection with defying a subpoena from the House Jan. 6 committee. Peter Navarro, a former trade adviser to Trump, began his sentence in March after his emergency appeal at the Supreme Court similarly failed.