The reason Trump did not take any questions was because they disrespected his position as president by yelling questions while he was trying to sign a Bill. He put his hand up to quiet them and they continued to shout. When he was done, he walked out.
I see the influence of his outstanding new press secretary Kayleigh McEnany. PDJT had nothing to gain by taking questions on extraneous subjects. The press was there for news about the economy.