As I understand Justice Brett Kavanaugh's recent decision in Trump v. Barbarar , he does not believe that the text of the 14th Amendment that codifies Birthright Citizenship in the US Constitution is clear enough. So he cites a clarifying law, federal statute 8 U.S.C. §1401(a) from 1952 to interpret how we should actually understand Birthright Citizenship. He used this law to justify his vote that Trump's understanding of birthright citizenship is incorrect. That's fine.
Then he suggests that Congress could write a new law to re-interpret our understanding of birthright citizenship to something better.
So Congress can just write a new law to change the current, clear interpretation of an amendment? Does that type of change apply to any part of the Constitution? I thought he was textualist?
I wonder how strongly he believes that a more liberal Congress has the right to pass a law to reinterpret the 2nd Amendment? How about a law something like the 2nd Amendment only applies to "arms" that existed in the eighteenth century? If we only allowed citizens to carry muskets we would have a lot fewer mass shootings.
The Constitution certainly needs some changes. But Trump has clearly shown that our assumption that presidents would have integrity and would at least try to follow the Constitution, their oath of office, laws, rules and precedents is outdated. That system basically worked for 250 years, but not now. The founders did not clearly limit presidential powers because they thought presidents would be men with integrity and any abuses would be handled by co-equal branches of government. Unfortunately, the branches are only co-equal now in their desire for an unlimited executive.
Now we have a president who sees himself as a supreme leader, supported by a Congress full of MAGA toadies that ignore their Constitutional duties and a Supreme Court that wants a president with limited checks and balances. They raised the president above the rule of law and interpret free speech to allow mega-donors to drown out the speech of ordinary citizens
The Constitution, the rule of law and legal the system is hard pressed to stand against such power. Allowing a cult president to push laws through Congress using simple majority votes to modify the Constitution is not the answer.

