Former President Donald Trump asked the Supreme Court on Monday to weigh his appeal of a lower court decision that he is not immune from criminal prosecution, a request that could further delay his 2020 election interference case.

Trump’s formal appeal serves as a pause on what would be a pivotal criminal trial for Trump while the Supreme Court deliberates on his request. The U.S. Court of Appeals for the District of Columbia Circuit, which ruled 3-0 last week against Trump’s presidential immunity claims, set the short deadline for Trump to appeal.