WASHINGTON — President Donald Trump signed a bill into law Friday that will make it easier for the Department of Veterans Affairs to fire employees, part of a push to overhaul an agency that is struggling to serve millions of military vets."Our veterans have fulfilled their duty to our nation and now we must fulfill our duty to them," Trump said during a White House ceremony. "To every veteran who is here with us today, I just want to say two very simple words: Thank you."Trump repeatedly promised during the election campaign to dismiss VA workers "who let our veterans down," and he cast Friday's bill signing as fulfillment of that promise."What happened was a national disgrace and yet some of the employees involved in these scandals remained on the payrolls," Trump said. "Outdated laws kept the government from holding those who failed our veterans accountable.