The company is currently considering additional models that could be built at its Chattanooga, Tennessee factory.

Volkswagen appears to have admitted that President Donald Trump's tariff threats and outlash at German automakers has led to uncertainty and stalled internal decision-making processes that could affect investment in its US factory.

"We hope that we're going to have clarity in the next months," VW brand chief Herbert Diess said at a media event for the new Arteon sedan, as quoted by Bloomberg. "It influences investment decisions."

Output volume had declined at the Chattanooga plant last year amid waning demand for its sole model, the Passat. The Atlas crossover has now joined the sedan, however, and will presumably bring a significant increase in annual production numbers.

Diess says VW wants to 'strengthen' the factory, noting that the US market represents the biggest profit pool and plenty of growth opportunities.

Additional models could include a new electric vehicle and another SUV. The latter appears to be viewed as a more likely candidate in the near term, potentially arriving by 2020.