In honor of National Voter Registration Day on Tuesday, the couple released a statement via their Archewell Foundation, stressing the importance of Americans heading to the polls.

The Duke and Duchess of Sussex did not participate in their staff’s voter registration event, but they encourage people to exercise their rights at the ballot box.

Meghan Markle and Prince Harry's Archewell Foundation mobilized on National Voter Registration Day on Sept. 17. All about the effort and Harry and Meghan's advocacy around encouraging the public to get out and vote.

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Prince Harry will return to Britain just two weeks after his 40th birthday to celebrate the "remarkable courage and achievements of children living with complex medical needs," he said in a statement.

In July, sources close to Harry told PEOPLE that his ongoing legal battle over the lack of official security for him and his wife Meghan Markle and their children Prince Archie, 5, and Princess Lilibet, 3, makes it tough for him to return to his home country.