It was always about immigration. It has negative impact on every other policy issue facing the current administration. It would not even be discussed without President Trump.
In the United States, there is strong evidence that the national interest has not been well served by the country’s immigration policy over the last five decades. Even as levels of immigration have approached historic highs, debate on the topic has been subdued, and policymakers and opinion leaders in both parties have tended to overstate the benefits and understate or ignore the costs of immigration. It would make a great deal of sense for the country to reform its immigration policies by more vigorously enforcing existing laws, and by moving away from the current system, which primarily admits immigrants based on family relationships, toward one based on the interests of Americans.