Investors in a luxury property development in India are being offered the chance to have “conversation and dinner” with Donald Trump Jr.
The eldest son of the US president is visiting India this week and will promote the Trump Towers development near Delhi.
Critics say the Trump family is cashing in on the president’s name.
But Mr Trump Jr has said he has been building relationships in India for years.
The full-page advertisement, which ran as the front cover of several Indian newspapers over the weekend, featured a picture of Mr Trump Jr together with text: “Trump is here. Are you invited?” and “Trump has arrived. Have you?”
Historian and biographer Patrick French was one of those criticising the advert.
The 47-storey towers in Gurgaon, close to the Indian capital, are being developed by the Trump Organisation and local partners.
The Trump Organisation, formerly headed up by President Donald Trump, is an umbrella company for hundreds of investments in businesses including real estate. Donald Jr is now its executive director.
India is the group’s biggest property market outside the US, and in 2016 the Trump family earned up to $3m (£2.14m) in royalties from ventures in India, according to a financial disclosure report.
Daniel S Markey, who worked on South Asia policy for the State Department during the George W Bush administration, said he was surprised by the involvement of Mr Trump Jr in an Indian business deal.
“The idea that the president’s son would be going and shilling the president’s brand at same time Donald Trump is president and is managing strategic and foreign relations with India – that is just bizarre,” he told the New York Times.
The Citizens for Responsibility and Ethics in Washington (Crew) – a watchdog group – added the Indian promotion to a list of instances it believes show the Trump name being used for commercial gain.
In an interview last week, cited by The Guardian, Donald Trump Jr said he had spent nearly a decade “cultivating relationships in India” and that the firm was “now seeing the response of that effort”.
He said his itinerary was designed to steer clear of politics.
However, he is listed as a keynote speaker at a global business conference, which will be attended by Indian politicians including Prime Minister Narendra Modi and some of India’s business elite.