Former President George W. Bush and his wife, Laura Bush, delivered pizzas to Secret Service members on Friday, calling for lawmakers "on both sides" to end the ongoing partial government shutdown.

"@LauraWBush and I are grateful to our Secret Service personnel and the thousands of Federal employees who are working hard for our country without a paycheck," the former president wrote in an Instagram post Friday afternoon.

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"And we thank our fellow citizens who are supporting them. It’s time for leaders on both sides to put politics aside, come together, and end this shutdown," he added.

Former presidents and first ladies receive lifetime Secret Service protection.

Roughly 800,000 federal employees have been furloughed or forced to work without pay amid the shutdown, which began on Dec. 22.

President TrumpDonald John TrumpSchiff urges GOP colleagues to share private concerns about Trump publicly US-China trade talks draw criticism for lack of women in pictures Overnight Defense: Trump to leave 200 troops in Syria | Trump, Kim plan one-on-one meeting | Pentagon asks DHS to justify moving funds for border wall MORE signed a bill this week guaranteeing back pay to federal workers who were furloughed during the shutdown.

Bush's comments are his first public remarks on the shutdown.

The shutdown was triggered last month amid an impasse between the White House and lawmakers over Trump's demands for more billions of dollars in funding for a U.S.-Mexico border wall.

Democrats have refused to comply with the White House's request for wall funding, while Trump has said he would not sign a spending bill unless it included more than $5 billion for his proposed border wall.