Trump said he would travel to Las Vegas on Wednesday to meet with victims, their family members and first responders.
Trump has weighed in on Twitter all week with comments that have aroused concerns his administration is weakening the rule of law.
Trump's briefing came at a time when polls show Vice-President Joe Biden leading him in the November presidential race and on a day when the US recorded more than 1,000 deaths, the first time the country has topped that mark in nearly 50 days. It is the highest single-day death total since June 2, when 1,052 fatalities were reported.
Trump tweeted: "Space Force all the way!"
Trump, who was scheduled to visit Britain on July 13, told members of the NRA in Dallas, Texas, on Friday that a "once very prestigious" London hospital, which he did not name, had become overwhelmed with victims of knife attacks.
Trump on Wednesday didn't deny what he told Woodward and defended his rosy public assessments on the virus as part of a possible effort not to "create panic''. But he called the book "just another hatchet job".
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Trump's predecessor, Barack Obama, enabled transgender people to serve openly in the military in 2016.
Trump has refined and sharpened his presentation since Helsinki.
Trump threatened to cancel the planned meeting with Putin after Russian forces opened fire on and seized three Ukrainian naval ships near the Kerch Strait for allegedly violating the Russian border on Sunday.
Tubbat rises with the sun and hops on his motorbike to ride 30 kilometers to tend to a saxual forest that was once desert.