Steve Bannon, a close ally of former president Donald Trump, has asked the Supreme Court to delay his four-month prison sentence while he appeals against his conviction.
He was found guilty nearly two years ago on contempt of Congress charges, after he defied a subpoena from the congressional committee investigating the 6 January riot in Washington.
A judge ruled that Bannon must report to prison to serve his sentence by 1 July. His appeal against that decision was denied on Thursday by a federal appeals court, so the Supreme Court remains Bannon's last chance at delaying his prison term.
Peter Navarro, another Trump adviser, failed a similar bid to overturn his contempt of Congress sentence and is currently serving time in prison.