The hat President Donald Trump wore during a phone call discussing Hurricane Harvey is on sale on Trump's campaign website, prompting ethics concerns.

Image #1: Picture of President Trump in a red hat, distributed by the White House

Image #2: Your chance to buy the red hat from his campaign pic.twitter.com/hehsMRYcyw — Citizens for Ethics (@CREWcrew) August 28, 2017

Red hats with "USA" on the front and "Trump" on the back are selling for $40 on the Trump campaign website. Citizens for Ethics pointed out Monday that Trump is wearing the same hat in a photo officially released by the White House of Trump on a teleconference call with cabinet officials about the storm.

The former head of the Office of Government Ethics Walter Shaub, who resigned last month after leading the office for over four years, made his opinion known on Twitter, responding to CREW's tweet.