28 U.S.C. 1441. - Actions removable generally

(c) Joinder of Federal law claims and State law claims.--(1) If a civil action includes--

(A) a claim arising under the Constitution, laws, or treaties of the United States (within the meaning of section 1331 of this title), and

(B) a claim not within the original or supplemental jurisdiction of the district court or a claim that has been made nonremovable by statute, the entire action may be removed if the action would be removable without the inclusion of the claim described in subparagraph (B).

(2) Upon removal of an action described in paragraph (1), the district court shall sever from the action all claims described in paragraph (1)(B) and shall remand the severed claims to the State court from which the action was removed. Only defendants against whom a claim described in paragraph (1)(A) has been asserted are required to join in or consent to the removal under paragraph (1).