Donald Trump campaigning

Republican presidential candidate Donald Trump speaks during a campaign event at St. Norbert College in De Pere, Wis., Wednesday, March 30, 2016. (AP Photo/Patrick Semansky)

Donald Trump is hoping to get a boost in the fall by gaining votes from Sen. Bernie Sanders supporters, the Wall Street Journal reported today.

The presumptive Republican presidential nominee has said repeatedly at rallies that he will earn the support of Sanders supporters in a general election matchup against Hillary Clinton.

The Democratic nomination is mathematically impossible for Sanders to reach.

In Journal and NBC polls conducted over the first four months of the year, Trump was predicted to earn only 10 percent of Sanders supporters, with Clinton earning 81 percent.

A more recent poll suggests an increase for Trump, with the real estate mogul earning 17 percent of the Vermont senator's supporters.

Only one of the voters interviewed by the Journal said that he would support Trump. Another said that his main reason for not supporting the GOP nominee now is the issue of nominating a Supreme Court Justice- but that he may vote for Trump in the fall.

After suggesting a debate with Sanders, Trump said Friday that the potential face-off will not happen. He had originally proposed the idea to raise money for charity.