TULSA - Sarah Palin has joined Donald Trump on the campaign trail, a day after endorsing the Republican front-runner.

She asked a crowd of thousands today in Tulsa, Oklahoma, if they are "ready to work to make America great again" -- an echoing of Trump's campaign mantra.

Palin had earlier missed a morning Trump campaign event in Iowa despite a scheduled appearance.

In Oklahoma, she also spoke about the arrest of her son, Track, earlier this week in a domestic violence case. Track Palin was charged with assault, interfering with the report of a domestic violence crime and possessing a weapon while intoxicated.

Sarah Palin suggested it's an example of the problems military veterans endure when they return to civilian life. She said they "come back a bit different" and "come back a bit hardened" -- and also wondering if the nation respects their sacrifice. And that, she said, "starts from the top."