bernie sanders and martin o'malley will campaign in iowa. some or all of the candidates may also have to answer questions about donald trump. support in the polls surging for the republican candidate despite all of the controversy he's attracted. cnn's senior washington correspondent joe johns has the latest. >> reporter: former new york governor george pataki launched an online petition urging merged to stand up to trump, after calling on his gop rivals to denounce the former reality tv star. >> these comments about mexicans that are so divisive, flat-out run. >> reporter: calling pataki a terrible governor of new york who couldn't be elected dogcatcher if he ran again. a change of heart from when pataki was governor and trump donated to his campaign. but companies doing business with trump appear to agree with the former new york governor, cutting ties with the real estate mogul observe the controversial comments made at