Your leader (“With Donald Trump in charge, it is harder to hold back the arms race clock,” Guardian, 21 January 2019; https://www.theguardian.com/commentisfree/2019/jan/20/the-guardian-view-on-trump-and-arms-can-the-doomsday-clock-be-stopped) is absolutely correct to point out that John Bolton, the national security advisor President Trump appointed is known for his visceral opposition to any kind of constraint on US [nuclear weapons] capabilities.”
But Trump himself has a personal history of having much more nuclear nuanced position that is rarely recognized.
He asserted in an interview on 15 December 2015, for instance: “The biggest problem we have is nuclear—nuclear proliferation and having some maniac, having some madman go out and get a nuclear weapon. That's in my opinion that is the single biggest problem that our country faces right now.”
So where else can we look? An article published in US news web site, Slate, provides an extraordinary insight. ("Trump’s Nuclear Experience: In 1987, he set out to solve the world’s biggest problem," www.slate.com/articles/news_and_politics/the_spectator/2016/03/trump_s_nuclear_experience_advice_for_reagan_in_1987.html).
Trump foresaw a situation soon when “hair-trigger” heads of state would have their hands on multiple nuclear triggers. And, Rosembaum observed, it drove him crazy that nobody in the White House sensed the danger.
The "Doomsday Clock" remains perilously close to disaster ("Nuclear arms threat keeps Doomsday clock close to midnight," 25 January 2019; https://www.theguardian.com/world/2019/jan/24/doomsday-clock-2019-two-minutes-midnight-nuclear-war-new-abnormal). President Trump is now in a position to do something about it himself.