I appreciate Reagan for his humble upbringings and journey from acting to politics, not a big fan of Iran-Contra or AIDS research cutbacks though...
Trump's Golden Dome seems a lot like Strategic Defense Initiative or Star Wars, meaning that it would take way too much time and money from an R&D perspective. If I were him I would concern myself with increasing our anti-ballistic defenses, as well as military and grid cybersecurity.
I would also avoid striking Iran and catering to Israel's demands because it is not a good use of taxpayer dollars and it would hurt our peace and trade consensus with China. Iranian missiles can't reach the US mainland, but Chinese and Russian missiles can.
As a moderate leftist I was disappointed in Biden because he wasn't competent enough to negotiate peace with China or try to restrain Israel's military tactics so they only target Hamas and not civilians.