WASHINGTON - US President Donald Trump came to office promising that he would produce so much winning that Americans would be sick of it. As he struggles to produce wins, some signs of frustration are starting to appear.Democrats' gleeful declarations that they outsmarted Republicans in a battle over a spending bill that avoided a government shutdown drew the ire of the president. Democrats were happy that funding for Trump's Mexico border wall was not included.Trump tweeted on Tuesday that maybe a government shutdown would not be so bad and that Republicans should consider changing Senate rules to make it easier to pass spending and other bills without any Democratic support."Our country needs a good 'shutdown' in September to fix mess!" he wrote.His comment frustrated some of his fellow Republicans in Congress, who chafed at the suggestion that the White House could dictate Senate rules, or send a message that a shutdown, which costs the economy millions, was desirable."I think it would be a good thing at this point if the iPhone was put in a safe, locked away and maybe returned in four years," Republican Senator Bob Corker, who was once on the short list to be Trump's vice president, told reporters.