Yes, Trump will say anything to get votes, and that shows he has no character. And what he says reveals he has no commitment to the Constitution--not even the parts that liberals sometimes like, such as the First and Fourth Amendments. He is also completely ignorant about most any topic of government policy, and shows no real desire to become informed on them.
Electorally, he would be a disaster, and not just for this cycle. If the Republican party nominates him, it would for a long time be known as the party that nominated Donald "Mexicans are rapists, women are objects, protesters should be attacked, the media should be silenced" Trump.