The U.S. Postal Service is suspending regular mail delivery Wednesday as the federal government shuts down to mark the national day of mourning for former President George H.W. Bush.

U.S. stock markets also are closing for the day and the announcement of Grammy Awards nominations is being put off until Friday.

A memorial service is to be held Wednesday at the National Cathedral in Washington for Bush, who died Friday at age 94.

The Postal Service said that while it was suspending regular mail delivery Wednesday, some services would continue due to demand for holiday gift deliveries.

"We will provide limited package delivery service on that day, to ensure that our network remains fluid and we do not experience any impacts to our package delivery operations that might negatively affect our customers or business partners during the remainder of our busy holiday season,” the Postal Service said in a statement.

Mail delivery has been suspended seven times to mark a president’s death since John F. Kennedy was assassinated in 1963.

President Trump signed an executive order closing the federal government Wednesday in Bush’s honor. Federal courts in the Eastern District of Pennsylvania and in New Jersey are among the federal offices closing Wednesday.

The U.S. Supreme Court has postponed arguments, and Congress has postponed votes.

Some federal employees may be required to report for work if their agencies decide they are needed for “national security, defense, or other public need,” according to Trump’s order.