LOL, he is going to get fired if he doesn't toe the line. You can't trust someone under duress especially someone who's life long work/career is being held, hostage. How is it logical to think we don't need to test people that are likely virus carriers just because they are not sick enough to hospitalize? The only way you can stop something like this is to isolate people that have the virus. Our country is doing it differently than every other country. Korea is testing 10k people a day.
All Trump cares about is holding the number of official cases down, and because of that, this virus is spreading like wildfire. Our mortality rate is 5% which is worse than mainland China and Iran. When we can't measure up to the standards of how third world countries are handling this, how can you trust Trump's government?
Look at the cruise ship off the coast of California right now. The government only tested 45 out of 3,000+ passengers Out those 45 people 21 positives. How can anyone justify not testing the rest of the passengers? We have a model of how this works. Over 700 people that were stuck on the cruise ship in Japan eventually got the infection.
There is no logical, scientific or medical reason to be withholding tests. In fact, all evidence says we should be testing as many people as we can.
Trump is a sick, sick man and his sickness is letting a virus with a 5% mortality rate spread across the entire country for the sake of keeping his numbers down.
Let's compare.
Here are how the infections are spread out in South Korea.

Here is how the infections are spread out in the U.S.

The difference is Korea tested people and attempted to contain the virus.