Known republican leaning judge, Reed O’Connor, in Fort Worth ruled Affordable Care Act is unconstitutional, – that a change in tax law last year eliminating a penalty for not having health insurance invalidated the entire law
Last year Trump signed a $1.5 trillion tax bill that included a provision eliminating the individual mandate 
Trump celebrated the 55-page ruling in two Tweets sent shortly after 9 pm, calling the rebuff of ACA ‘great news for America’ 
The Affordable Care Act will remain in force pending its expected appeal to Supreme Court