MONTPELIER, Vt. — Senator Bernie Sanders returned to his home state on Saturday for the first time since he declared in February that he was running for president again, displaying the uncompromisingly liberal defiance that many of those in the audience have been hearing for decades. Under overcast skies, Mr. Sanders lamented big corporations, argued for “Medicare for all” and assailed fossil fuels. He also took the opportunity to emphasize his foreign policy agenda — including his opposition to the war in Iraq and to American support for Saudi Arabia’s war in Yemen — while lacing his remarks with criticism for the news media even as he criticized President Trump for calling journalists “the enemy of the people.” “Recently, I have been attacked in the media because of my views, actions and votes on foreign policy issues,” he said. “I make no apologies,” he repeated several times. In recent days, news outlets including The New York Times and The Washington Post have published reports about Mr. Sanders’s foreign policy record in the 1980s when he was the mayor of Burlington, Vt., which included trips to Nicaragua in support of the Sandinista government, as well as to the Soviet U...