What brought the radical and moderate republicans together in an alliance against president johnson? :
a the president's vetoes of the freedmen's bureau bill and the civil rights act of 1866.
b realization by congressional republicans that johnson was delaying readmission of the former confederate states.
c the president's proposal for an agency that would provide relief, rations, and medical care for impoverished southerners.
d a desire to send a message to northern democrats that they could work together to rebuild the south.