The Republican Party of Ronald Reagan has completely transformed in the 40 years since, and has become alien to the beliefs of conservatives, due to the impact of Donald Trump.
Ronald Reagan believed the Soviet Union was a threat to world democracy, while Trump and MAGA supporters are openly pro Russian Federation, as well as friendly to North Korea and China, and also other authoritarian regimes around the world. So Trump and his supporters are isolationists, and do not give a damn about Ukraine.
Ronald Reagan believed in free trade, but now Donald Trump and his ilk promote protectionism, and pledge rise in tariffs if he elected, which would increase the cost of living for all Americans.
Roneld Reagan believed in supporting immigration as a strength of America, while Trump and his supporters are nativists, who wish to prevent all immigrants from anywhere but Europe.
The historical Republican Party is now dead, only kept alive by a small number of old line Republicans, who wish for a return to the ideals of Ronald Reagan.
Ronald Reagan had many faults and shortcomings, but it is clear he would not support the Donald Trump controlled Republican Party!