UNITED STATES (Reuters) - US President Barack Obama says presumptive presidential candidate Donald Trump is not a "legitimate spokesperson" for working class people, according to an interview that aired on Tuesday (June 28).

"He's hardly a spokesperson for- a legitimate spokesperson for a populous surge from working class people on either side of the Atlantic," Mr Obama told National Public Radio.

In a visit to the Rust Belt states of Ohio and Pennsylvania on Tuesday (June 28), Mr Trump, the presumptive Republican nominee, plans to attack Hillary Clinton's record on trade, questioning her commitment to fight for American workers, a campaign aide said.

Mr Trump has seized on Britain's vote to leave the European Union to bolster his argument that voters are rising up against establishment leaders, saying Americans would reject the "global elite" and support his presidential candidacy.

In a trade speech in southwestern Pennsylvania on Tuesday, Mr Trump will tie Mrs Clinton to trade deals such as the Trans-Pacific Partnership, which unions oppose, and will discuss his own trade agenda, including his plans to label China a currency manipulator, the aide told Reuters.

Mr Trump will visit Ohio later in the day.