President George W. Bush and brother Jeb Bush in 2006 (AP Photo/Ron Edmonds, File) ORG XMIT: WX105

George W. Bush and Jeb Bush in 2006. (Ron Edmonds, AP)

Former president George W. Bush jumped into the 2016 presidential race Thursday with a fundraising letter on behalf of brother Jeb.

“This is a consequential time in our nation’s history, and we need a strong leader,” the 43rd president said in the missive. “Jeb took on tough challenges as Florida’s Governor and delivered results. I know he will do the same as President.”

The Bush campaign is also planning a “donor summit” for late October in Houston featuring Jeb’s brother and his father, former president George H.W. Bush.

The George W. Bush fundraising e-mail comes as Jeb Bush has fallen behind in Republican polls to GOP front-runner Donald Trump.

“My brother will be a tremendous President,” George W. writes. “He is a proven leader with an optimistic outlook and a clear, conservative agenda for America’s future.”

The former president added: “He’s got a tough road ahead — take it from someone who’s been there. With his strengths and your support, he will succeed. But he needs you.”