Tulsi Gabbard , President Trump's director of national intelligence, announced Friday she is leaving the administration. Driving the news: Gabbard wrote in her resignation letter that her departure is related to her husband's diagnosis with an "extremely rare form of bone cancer." "At this time, I must step away from public service to be by his side and fully support him through this battle," she wrote. "Abraham has been my rock throughout our eleven years of marriage — standing steadfast through my deployment to East Africa on a Joint Special Operations mission, multiple political campaigns, and now my service in this role." Gabbard's resignation will go into effect on June 30. Aaron Lukas, the principal deputy director of national intelligence, will take over as acting director of national intelligence, Trump said in a Truth Social post .…