Bernie Sanders bore down on Donald Trump's economic agenda in a series of tweets on Friday morning, calling him "the poster child of failed trade policies."

The social media take-down began with Sanders posting a link to a Washington Post story from earlier this week, which revealed how a "little-noticed provision in Donald Trump's tax reform plan has the potential to deliver a large tax cut to companies in the Republican presidential nominee's vast business empire."

Donald Trump is only looking out for himself and his billionaire friends? Not surprised. https://t.co/GyFVEQsDVq — Bernie Sanders (@BernieSanders) August 12, 2016

Then Sanders got on a roll, eviscerating Trump's positions on trade and taxes:

Why would we even expect Trump to come up with a serious plan to fix a rigged economy? He's the one who rigged it. — Bernie Sanders (@BernieSanders) August 12, 2016

Donald says he will "fix" trade. He can start by shutting down his own sweatshops in Bangladesh and pay workers in the U.S. a living wage. — Bernie Sanders (@BernieSanders) August 12, 2016

Wanna know why Trump believes wages are too high in the U.S.? He is used to paying 30 cents an hour in low-wage countries abroad. — Bernie Sanders (@BernieSanders) August 12, 2016

How serious is Trump about fixing the trade problem? From (now-defunct) Trump University: "Outsourcing Creates Jobs in the Long Run." — Bernie Sanders (@BernieSanders) August 12, 2016

He's the poster child of failed trade policies:

❌ Trump clothing made in Mexico

❌ Trump ties made in China

❌ Trump shirts made in Bangladesh — Bernie Sanders (@BernieSanders) August 12, 2016

Meanwhile, Trump is proposing huge tax breaks to millionaires and billionaires while gutting the Department of Education and the EPA. — Bernie Sanders (@BernieSanders) August 12, 2016

Trump's plan to repeal the estate tax alone would give a $269 billion tax break over a 10-year period to the top two-tenths of 1 percent. — Bernie Sanders (@BernieSanders) August 12, 2016

Trump's plan to repeal the estate tax alone would give a $269 billion tax break over a 10-year period to the top two-tenths of 1 percent. — Bernie Sanders (@BernieSanders) August 12, 2016

In total, Trump wants to provide a $3 trillion tax cut to Americans who make over $1 million a year. — Bernie Sanders (@BernieSanders) August 12, 2016

As Politico notes, "Trump has repeatedly used Sanders' attack line questioning Clinton's judgment on the trail and consistently claimed that Sanders' supporters will back his campaign because of where he stands on trade."

Friday's tweetstorm appears to be part of Sanders' ongoing push to ensure that does not happen.