President Donald Trump on Saturday praised police in Boston for "looking tough" in response to the presence of "many anti-police agitators" in the city, as a wave of counter-protesters overtook a previously scheduled "free speech" rally. "Looks like many anti-police agitators in Boston. Police are looking tough and smart! Thank you," Trump wrote on Twitter.According to the Associated Press, thousands of demonstrators chanting anti-Nazi slogans marched through the city to the Boston Common.