U.S. President Donald Trump on Monday, his first day back in office, signed an executive order postponing the country's ban of TikTok for 75 days. But whether this move was lawful is up in the air.

At the moment, there are "no plans" for a TikTok ban in the UK, a government spokesperson said on Saturday. "We engage with all major social media companies to understand their plans for ensuring the security of UK data and to ensure they meet the high data protection and cyber security standards we expect."

TikTok went dark for a few hours in the U.S. before the ban was suddenly reversed Sunday. Here's what to know about President Trump's executive order.