I want to believe that they have the evidence to back this up, and that we can trust what the administration says. But the United States has been trashing its own credibility on the international stage ever since 9/11 & weapons of mass destruction in Iraq. The Trump administration did nothing to help this.
It's so easy to lose credibility and so hard to build it back. I wish we would stop blowing our credibility by making politically motivated statements without the evidence to back them up.