President Joe Biden enjoyed high approval among Americans in the early months of his presidency. Millions of vaccines were distributed throughout the United States. The White House trumpeted high job growth as proof of a rebounding economy.

But privately, Biden’s lead pollster was already sounding the alarm that even with the early successes, certain gathering threats could sink support for the president and his party.

"Immigration is a growing vulnerability for the president,” John Anzalone and his team warned in a package of confidential polling, voter surveys and recommendations compiled for the White House. "Voters do not feel he has a plan to address the situation on the border, and it is starting to take a toll.”