For eight months, the conservative supermajority has helped Trump amass power, temporarily lifting about 20 rulings that were thwarting his initiatives. The court now is positioned to consider the underlying legal questions behind his imposition of global tariffs, bid to control independent regulatory agencies — including the Federal Reserve — and effort to restrict automatic birthright citizenship. Chief Justice John Roberts and his court must decide what lines to draw with a president who has repeatedly said his election means he can do whatever he wants.