Carl Icahn said Pfizer's (NYSE: PFE) potential move out of the country (rumor merger with AGN) is "much more dangerous than most people believe."

1/3 Unfortunately, my warning concerning the imminent exodus of many of our best companies is coming true.

— Carl Icahn (@Carl_C_Icahn) October 29, 2015

2/3 Today Pfizer confirmed they are planning to move out of the country. The situation is much more dangerous than most people believe.

— Carl Icahn (@Carl_C_Icahn) October 29, 2015

3/3 There is no reason Congress cannot act now to pass international tax reform with the Highway Bill.Read my letter https://t.co/fbbB8mNWMR

— Carl Icahn (@Carl_C_Icahn) October 29, 2015