President Joe Biden and other top aides have called on port companies to negotiate fair deals for striking dockworkers and warned against profiting off the strike.Kent Nishimura/Mark Felix/Getty ImagesPresident Joe Biden called for port companies to offer fair deals to striking dockworkers.The transportation secretary, Pete Buttigieg, warned against exploiting the strike for profit.He and the acting labor secretary, Julie Su, urged dock workers and companies to negotiate.President Joe Biden and other government officials are urging port companies to offer stronger contracts to the 45,000 dockworkers on strike at East and Gulf Coast ports.They're intervening because of the strike's huge economic stakes.