Des Moines Register: Iowa politicians, farmers and business leaders were cautiously optimistic about a Chinese trade agreement that President Donald Trump announced “in principle” Friday. But some said they wanted more specifics from the White House, citing other times over the past year when expected relief from trade tensions failed to materialize. Trump said Friday during a White House visit by Chinese Vice Premier Liu He that he had reached an agreement on “phase one” of a trade deal. The United States will suspend a new round of tariffs on $250 billion worth of Chinese goods, scheduled to begin Tuesday, and China, in turn, will suspend its planned retaliatory tariffs.