The main concern in vertical deals like the tie-up with Time Warner is foreclosure, Sen. Mike Lee said, which is denying competing companies access to suppliers and customers.
Fitbit is acquiring intellectual property and staff from Pebble, which is being shut down. Reports have suggested the deal cost between $34 million and $40 million.
Chairman and CEO Lowell McAdam argues that Netflix started off modestly, too.
The president-elect has had a frosty relationship with Silicon Valley, but the meeting could could allow executives to argue their case and give clues about Trump's stance on technology.