Robert Kagan, a neoconservative commentator and a vocal supporter of President George W. Bush’s invasion of Iraq, will speak at a fundraiser for Hillary Clinton’s campaign next month, according to Foreign Policy.

Foreign Policy obtained an invitation to the event — which is being hosted in Washington’s Logan Circle neighborhood July 21 — that promised “an off-the-record conversation on America’s continued investment in NATO, key European allies and partners, and the EU.”

Kagan, who served as an advisor for Sen. John McCain’s 2008 presidential campaign, is part of the conservative foreign policy establishment that has resisted Donald Trump as the GOP nominee. Earlier this week, the Clinton campaign touted the endorsement of Brent Scowcroft, a national security adviser to Presidents George H. W. Bush and Gerald Ford.

Kagan publicly voiced his intention to vote for Clinton if the general election came down to her and Trump in a February op-ed for the Washington Post.

“For this former Republican, and perhaps for others, the only choice will be to vote for Hillary Clinton. The party cannot be saved, but the country still can be,” he wrote then.