Mike Pence adviser claims she was told to spy on Deborah Birx

A former adviser to Mike Pence says she was told to "spy" on Dr Deborah Birx, the White House's coronavirus taskforce coordinator during the Trump administration.

In response to Ms Birx speaking out publically this week, Ms Troye said she saw first hand the "very challenging situations" the administration placed on its health expert.

"I'm the person that actually was brought into a room at some point when she first started, and she was coming into a no-win situation even more so than, I think, she even realized," Ms Troye said in an interview with MSNBC's Chris Hayes on Monday.

"I was told that I was to watch her, that she was not to be trusted, because she was a Matt Pottinger hire."