Immigration is the most vital domestic issue because it impacts everything else in the U.S. It's also the issue that helped elect Donald Trump. Yet the initial version of WhiteHouse dot gov doesn't highlight it. The Trump version of the site is very barebones and that might change, but if it were truly a key issue for Trump he'd put it front and center.

The "Issues" menu contains six "Top issues" (image below), none of which focus just on immigration. Of the six issues, only "Standing Up For Our Law Enforcement Community" (link) mentions immigration and that's in just two of eight paragraphs:

President Trump is committed to building a border wall to stop illegal immigration, to stop the gangs and the violence, and to stop the drugs from pouring into our communities. He is dedicated to enforcing our border laws, ending sanctuary cities, and stemming the tide of lawlessness associated with illegal immigration.

Supporting law enforcement also means deporting illegal aliens with violent criminal records who have remained within our borders.

Trump's Inaugural Address briefly mentions immigration in a few of its 75 short paragraphs:

[For many decades] We've defended other nation’s borders while refusing to defend our own;

...Every decision on trade, on taxes, on immigration, on foreign affairs, will be made to benefit American workers and American families.

We must protect our borders from the ravages of other countries making our products, stealing our companies, and destroying our jobs. Protection will lead to great prosperity and strength.

...We will bring back our jobs. We will bring back our borders. We will bring back our wealth. And we will bring back our dreams.

The Address also contained, among many other questionable statements, "From this moment on, it’s going to be America First." If I were a foreign leader, I'd interpret that as Trump giving me the middle finger. Hopefully most will realize he's all just hot air playing to his base.