Donald Trump has a YUUGE heart. Those of us that support him see that. I think Cruz has to fix the citizenship issue somehow and Donald would consider him seriously for VP. Cruzers can keep denying that the citizenship eligibility issue is bogus but it is not and it is not going away. It will haunt Cruz till the very end.
You bring up two interesting questions.:
Trump spent five months or so saying Trump was eligible. Now he isn't eligible?
You say Cruz has to fix it. How can he fix it?