Only a small fraction of recent G.O.P. broadcast and streaming ads mention the president, according to a Times analysis of ad data.

© Kenny Holston/The New York Times

Alex Tait on a proposed amendment to the representation of the people bill, and Dr Joseph Mullen on Russian interference in the Brexit referendum

Andy Burnham’s comments about Russian interference in Brexit (Report, 11 October) and the warning by the MI5 chief, Ken McCallum, against exaggerating its impact (Report, 13 October) risk overlooking another serious threat to electoral integrity: disinformation from our own political parties and campaigners.

Foreign interference deserves scrutiny, but misleading factual claims in electoral advertising are unregulated, unlike in commercial advertising. We have four sets of rules to ensure an advert for a packet of sausages is accurate, but none for the most important advertising of all – ads that influence how we vote.

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© Photograph: Tuomas A Lehtinen/Getty Images

© Photograph: Tuomas A Lehtinen/Getty Images

© Photograph: Tuomas A Lehtinen/Getty Images

With Republicans seen as less likely to hold their majority in the House, the party is focusing more on the battle for the Senate, where it is vastly outspending Democrats on ads.

© The New York Times