lead a mass at a shrine near santiago, cuba, before heading to the u.s. the pope has been warmly received during his four-day visit to the island nation. the vatican says 200,000 people attended his mass in havana. president obama and the first lady will greet the pope when he lands later tuesday near washington. the u.s. is accusing volkswagen of cheating on air standard tests. the environmental protection agency says the automaker installed of the r software on about 500,000 diesel cars that lowered emissions during testing. the e p,a says the vehicles emitted up to 40 times the legal levels of nitrous oxide when the software switched off. u.s. presidential candidate ben cash son is trying to clarify his remarks he would not support a muslim candidate for the white house. carson now says he could support a muslim if they renounced sharia law which is a key tenet of islam. scott walker is ending his u.s. presidential pabid. he is the second republican to