https://petitions.whitehouse.gov/petition/our-lady-holy-rosary-our-lady-victory-novena-president-trump
FYI - There is a delay of a few hours, from the time you sign the petition to the time it displays the updated number of signatures on the website.
Amen to the novena prayers! May Mary cover President Trump under her blue mantel, and aid him in his fight against the Evil One. May she be Mother and Confidence to Melania. May she watch over Barron with motherly solicitude. Amen.