The US Postal Service will "suspend regular mail deliveries, retail services, and administrative office activity" on Wednesday for the national day of mourning honoring the late former President George H.W. Bush.

The news comes after the White House said Saturday that President Donald Trump would declare Wednesday a national day of mourning for the country's 41st president. 

On Wednesday, the late former president will be laid to rest. A memorial for his family and friends will be held at the National Cathedral in Washington for an 11 a.m ET memorial service. 

Former Presidents Barack Obama, George W. Bush, Bill Clinton and Jimmy Carter are expected to attend the service, as well as sitting president Trump.

"Out of respect for the 41st President of the United States and to honor his vast contributions to our country during his lifetime, and consistent with the Presidential Proclamation," a statement on the USPS website states, "the United States Postal Service will suspend regular mail deliveries, retail services and administrative office activity on Dec. 5."

"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.

US financial markets will also be closed on Wednesday to honor Bush, and the US Supreme Court postponed arguments.