The meeting on Thursday was attended by around 700 leaders.
Speaking at the event Donald Trump said: "Pray for me. I pray for you."
He went on to say: "This will be an election that will go down in the history books. For evangelicals, for Christians, for everybody of religion.
"This may be the most important election that our country has ever had. So go out and spread the word.
"And once I get in, I will do my thing that I do very well. And I figure it is probably, maybe the only way I'm going to get to heaven. So I better do a good job."
The Washington Times says he was led on stage by a pastor and left the stage with a standing ovation.
The pastor led the gathering in prayer and asked for "strength, wisdom and protection" for the Trump family.
He asked for wisdom and clarity and prayed "Lord, that you give them a new revelation of the work of the cross and the power of the resurrection."
"We believe that the heart of this nation is in your church.
"May you awaken the hearts of the nation - your church - for a healing of the soul of this nation. God, we ask you to go before the Trumps and be their guard."
In September, Donald Trump is appearing at another evangelical event, the Values Voter Summit.
He will be first nominee to address the event since it was founded ten years ago.