- Flake warns: Trump headed for GOP primary challenge in 2020Fox News
- Is Jeff Flake thinking about challenging Trump in 2020?USA TODAY
- Flake leaves the door open for 2020 presidential runCNN
- Flake: Trump rallies reflect ‘spasms of a dying party’The Hill
- Sen. Jeff Flake says GOP rallies look like ‘spasms of a dying party’ as he warns Trump’s behavior is ‘inviting’ a …Daily Mail