House Oversight Committee Chairman James Comer (R-KY) said Sunday that there are still “so many” questions that remain unanswered about Gov. Tim Walz’s (D-MN) connections with China ahead of Election Day.

Walz, Vice President Kamala Harris’s running mate, had been monitored by the Department of Homeland Security “for many years” due to his many visits to China, according to Comer, who said this information was coming from a DHS whistleblower. Comer also noted that Walz did not have the financial backing to visit China as many times as he did, and that “all the boxes are checked” on the Oversight Committee and the DHS’s checklist for a U.S. official or their family member “being influenced by the Chinese Communist Party.”