Investing.com - President Donald Trump is making plans for a fresh crackdown on Chinese investment in the U.S.New rules, which could be announced within days, would block firms with at least 25% Chinese ownership from acquiring American companies involved in ‘industrially significant technology’, such as robotics and aerospace..Trump is also planning to restrict U.S. companies from selling certain technologies to China, according to the Wall Street Journal.Such a move would counter a Chinese initiative to be a global leader in technology and mark another escalation in the trade conflict between Washington and Beijing, following the threat of tit-for-tat tariffs.Investors are fearful that an all-out trade war could roil financial markets and dent global growth.Trump also fired a warning shot at U.S. trade partners over the weekend, tweeting that they must drop trade barriers and tariffs, even as he imposes them on U.S. imports.