Sen. Bernie Sanders and supporters of his presidential campaign took on 2020 Democratic primary foe former Vice President Joe Biden\u0026#039;s record on trade to sharpen the contrasts between the two candidates ahead of next week\u0026#039;s nominating contests in six states, including the Rust Belt state of Michigan.Just before leaving Phoenix to attend a rally in Michigan on Friday, Sanders held a brief press conference in which he said Biden\u0026#039;s vote as a then-senator for the 1994 North American Free Trade Agreement (NAFTA) showed a \u0022fundamental difference\u0022 between the two candidates.\u0022In terms of the coming general election we don\u0026#039;t have to predict what [President Donald] Trump will be saying about Joe Biden, because he is already making those attacks. Trump—who won Michigan, who won Wisconsin, who won Pennsylvania—made one of his major campaign tenets his opposition to NAFTA and PNTR [Permanent Normal Trade Relations ] with China,\u0022 said Sanders.\u0022In 2016, he criticized those trade policies as being disastrous—and just yesterday, he made that claim,\u0022 Sanders continued. \u0022The truth is, and we have to be honest about this, that NAFTA and PNTR cost this country well over 4 million good paying jobs. In Michigan alone, these disastrous trade agreements led to the loss of more than 150,000 good paying jobs. And not only job loss—when good paying jobs go, you are involved in a race to the bottom and employers can pay lower wages.\u0022\u0022These trade agreements have been a disaster for the people of Michigan, the state of Vermont, and for the entire country. Joe Biden and I have very strong and different positions in terms of how we reacted to NAFTA and PNTR,\u0022 Sanders said.Back when the votes were taken, he continued, \u0022I can remember it like it was yesterday, I was on a picket line in Montpelier, Vermont with workers opposing these disastrous trade agreements. I vigorously opposed these agreements; I helped lead the opposition to these agreements. Joe Biden supported those agreements. And that is a fundamental difference about our approach toward the trade union movement and towards the needs of working people.\u0022Biden\u0026#039;s vote for the deal has been easy fodder for Trump attacks.\u0022Joe Biden made a deal, NAFTA,\u0022 the president said Thursday at an event in Scranton, Pennsylvania. \u0022He approved it, he was pushing it. It\u0026#039;s the worst trade deal ever made.\u0022According to Sanders campaign manager Faiz Shakir, the president\u0026#039;s comments are simply more evidence Sanders would be a better candidate to go up against Trump in the general election.Think hard about the campaign that can truly take it to Trump https://t.co/ZSnGFObWOi— Faiz (@fshakir) March 6, 2020The Sanders campaign appears to be making sure voters in communities harshly hit by so-called free trade deals won\u0026#039;t forget Biden\u0026#039;s record. The campaign rolled out this week three new televsion ads, including one focused on trade.That ad features union autoworker Sean Crawford, who speaks about how his community has been \u0022decimated by trade deals.\u0022\u0022Only one candidate for president consistently opposed every disastrous trade deal,\u0022 says Crawford, \u0022and that candidate is Bernie Sanders.\u0022In an article entitled \u0022Biden\u0026#039;s Nafta Vote Is a Liability in the Rust Belt\u0022 and published last May at Bloomberg Businessweek, Joshua Green wrote that the trade dealled to an exodus of U.S. manufacturing jobs to Mexico and hurt wages for U.S. workers who held on to their jobs. Throughout the 2016 presidential campaign, Trump pilloried Nafta as a \u0022disaster\u0022 and \u0022the worst trade deal ever,\u0022 a message his top advisers believe was pivotal in helping him carry critical Rust Belt states once considered Democratic strongholds.\u0022Nafta still resonates in the industrial Midwest and Rust Belt,\u0022 says Stanley Greenberg, a veteran Democratic pollster who recently conducted focus groups on trade in Michigan and Wisconsin. \u0022There\u0026#039;s still a lot of anger because it symbolizes, for many people, the indifference about the outsourcing of jobs and the favoring of elite economic interests in international trade agreements.\u0022The youth-led Sunrise Movement shared that article Friday morning with a tweet suggesting it provided evidence Sanders should get the Democratic ticket.Who should debate Trump on trade? @joebiden killed jobs in Michigan and supercharged the climate crisis #NAFTA @berniesanders will create millions of good jobs to stop the climate crisis and reverse the damage of bad trade deals. #GreenNewDealhttps://t.co/PdUhWPlmBS— Sunrise Movement\u0026nbsp; (@sunrisemvmt) March 6, 2020In addition to Michigan, Idaho, Mississippi, Missouri, North Dakota, and Washington will hold primaries Tuesday.