After signaling earlier in the day that his leadership style could lend itself to passage of immigration overhaul without the votes of a majority of his own party, Speaker John A. Boehner, R-Ohio, took some heat from outside conservative groups. The Conservative Action Project on Tuesday afternoon circulated a letter to House Republican lawmakers co-signed by dozens of influential movement leaders, urging them to formally adopt the “Hastert Rule.” Named for Rep. J. Dennis Hastert, R-Ill., who served as speaker from 1999 to 2007, the rule dictates that no bill come to the floor without assurance that a majority of...