Sessions argues deportations focused just on those with criminal records.
The president and top officials huddled with activists at the White House.
Obama called for review of the administration’s enforcement policies for immigration laws.
Top Hispanic Dems in the House discussed next steps on immigration reform.
Advocates want the administration to expand its deferred action program.
The president says he is "champion-in-chief of comprehensive immigration reform."
The pressure creates a serious dilemma for Obama.
Obama told Democrats he can't make some changes without congressional action.