"It's no secret that President Bush is all in for Jeb, and he's proud to help by participating in fundraisers across the country as his schedule permits," Freddy Ford, a spokesman for George W. Bush, said in a statement.
In a fundraising appeal that went out to Bush supporters this week, the former president wrote that "I rarely send emails like this, but I wanted to make sure I asked for your support on behalf of my brother, Jeb."
"This is a consequential time in our nation's history, and we need a strong leader," he added.
The New York luncheon that George W. Bush is headlining was originally set to take place on Sept. 8 but had to be rescheduled for Sept. 10, putting the former president in the city the day before the 14th anniversary of the 9/11 terrorist attacks. He is not expected to remain in New York, however, having already committed to a participate in a commemoration in Dallas that day.
The former president's stepped-up presence on the fundraising circuit comes after he indicated earlier this year that he planned to steer clear of the 2016 race, saying he did not want to fuel an anti-dynastic backlash. Dealing with his legacy has proven to be a complicated political challenge for Jeb Bush, who has sought to carve out his own identity without criticizing his brother. The two have yet to campaign publicly together.