Ecuador's ambassador to the UK, Ana Alban, has told ITV News the microphone allegedly found inside her embassy is going to be sent away to be tested.
She said: "We found something, but we don't know what it is, and we are sending it to someone...I don't know how long it has been there."
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The Labour leader will say figures show that 2.4 million young people are missing from the electoral register.
ITV News took to a gun range in Maryland to find out if those that voted to “Make America Great Again” still think they voted correctly.
Initial indications were that the test on Friday was unsuccessful, according the a US government source who spoke to Reuters.