Michael Gerson, a speechwriter for President George W. Bush who helped craft messages of grief and resolve after 9/11, then explored conservative politics and faith as a Washington Post columnist writing on issues ranging from President Donald Trump’s disruptive grip on the GOP to his own struggles with depression, died Nov. 17 at a hospital in Washington. He was 58.

The cause of death was complications from cancer, said Peter Wehner, a longtime friend and former colleague.

After years of working as a writer for conservative and evangelical leaders, including Prison Fellowship Ministries founder and Watergate felon Charles Colson, Mr. Gerson joined the Bush campaign in 1999. Mr. Gerson, an evangelical Christian, wrote with an eye toward religious and moral imagery, and that approach melded well with Bush’s personality as a leader open about his own Christian faith. …

In the chaotic months after the Sept. 11, 2001, attacks, Mr. Gerson became the key craftsman articulating what became known as the “Bush Doctrine” — which advocated preemptive strikes against potential terrorists and other perceived threats. With his team of writers, he began shaping Bush’s tone and tenor, including addresses at Washington National Cathedral on Sept. 14 and to a joint session of Congress on Sept. 20.