From the Guardian, reporting on Jeremy's speech:

In a question and answer session after the speech.....

...Corbyn argued that seeking fresh deals with China or the US was not something Labour wanted to pursue, as that would not compensate for the loss of trade with EU countries.

"Both the US and China have weaker standards and regulations that would risk dragging Britain into a race to the bottom on vital protections and rights at work," he said, arguing against a TTIP-style deal that could force open parts of the NHS or any new rules that would mean asking "the British public to eat chlorinated chicken."

Looks like China and the US won't be falling over themselves either...