Prime Minister Theresa May is privy to the same information and intelligence as US officials, a Downing Street source told CNN.
She has discussed security several times with US officials over the past few weeks, the source said.
A decision may be announced later in the day, the source added.
The Trump administration has ordered nine airlines flying from 10 airports in the Middle East and Africa to stop passengers from bringing most types of electronic devices into the cabin for US-bound flights. Instead, they will have to check them in.
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The indefinite ban will affect more than 50 flights from the airports in the mainly Muslim countries, including major hubs such as Dubai and Istanbul, according to senior US administration officials.
The 10 international airports covered by the ban are in Cairo, Egypt; Dubai and Abu Dhabi, UAE; Istanbul, Turkey; Doha, Qatar; Amman, Jordan; Kuwait City; Casablanca, Morocco; and Jeddah and Riyadh, Saudi Arabia.
The nine airlines affected by the U.S. Ban were notified of the procedures by the Transportation Security Administration today and must comply within 96 hours.