The "Squawk on the Street" news team discuss the legality of activist investor Bill Ackman backing the bid of Valeant Pharmaceuticals to acquire Allergan.
U.S. stock index futures pointed to a lower open on Tuesday, ahead of first-quarter earnings early in the day from three Dow-listed companies.
Asian equities were mixed on Tuesday as investors were cautious about the prospect of further U.S. sanctions on Russia.
Discussing Bill Ackman's partnership with Valeant to pursue a takeover of Allergan, with CNBC contributor Herb Greenberg and CNBC's Meg Tirrell.
CNBC's Seema Mody reports according to the Dow Jones, activist investors Bill Ackman is teaming up with Valeant to pursue a takeover of Allergan. Anthony Scaramucci, SkyBridge Capital, provides insight.
Some of Tuesday's midday movers: