Former President Donald Trump‘s peddling commercial products while running for the White House is putting campaign finance norms to the test, according to ethics experts.

The latest example came this week when the GOP nominee announced Trump-branded gold watches, which he called “truly special,” sandwiched between campaign stops and meeting with a world leader.

“The Official Trump Watch Collection is here, and these Watches are truly special,” Trump wrote in a social media post that included a link to GetTrumpWatches.com. “You’re going to love them. Would make a great Christmas Gift. Don’t wait, they will go fast. GET YOUR TRUMP WATCH RIGHT NOW!”