Only one day after a federal court approved a blockbuster $85.4 billion merger between AT&T Inc. and Time Warner Inc., cable giant Comcast Corp. announced a $65 billion bid for a sizable chunk of Rupert Murdoch’s 21st Century Fox Inc.

The close timing between those two deal developments makes it appear as if the court’s approval of AT&T’s bid for Timer Warner triggered Comcast’s own announcement.