The very mention of Israel at Hillary Clinton’s initial campaign events for president was controversial among her aides, who feared it might stir unwanted controversy with her party base, according to internal correspondence released by Wikileaks.

The emails, which the Clinton campaign has not confirmed as authentic, featured an exchange between one of Clinton’s top foreign policy advisers, Jake Sullivan, and Robby Mook, her campaign manager, over the wisdom of raising her support for Israel at public events. Sullivan suggested she raise her commitment to Israel to show voters that she is “standing up for our allies and our values.”

Mook disagreed. “We shouldn’t have Israel at public events. Especially ‘dem’ activists,” he wrote.