Bill Clinton is defending his family foundation. In an email to supporters, the former president is blaming “the political season in America” for criticism of the foundation.

“Chelsea and I recently returned from a trip to Africa where we saw the results of the work that you support through the Clinton Foundation. We make this trip almost every year to see the work our Foundation, the Clinton Health Access Initiative (CHAI), and CGI partners do, and the people we’re able to help,” writes the spouse of the presidential candidate.