A second Donald Trump (left) presidency would be bad for bonds, said investor Bill Gross.James Devaney for GC Images; Tim Rue for Getty ImagesBill Gross warned that a second Trump presidency could harm bond markets.Gross highlighted that Trump's tax cuts and spending programs would worsen the fiscal deficit.The candidates have put forward very different tax plans on their presidential agendas.Donald Trump winning the presidential election would be bad news for the bond markets, said "Bond King" Bill Gross.A Trump presidency would worsen US fiscal deficits, which would hurt bonds, the billionaire investor and PIMCO cofounder said in an interview with the Financial Times."Trump is the more bearish of the candidates simply because his programs advocate continued tax cuts and more expensive things," Gross said.