Pressing ahead with steep tariffs on Canada and Mexico risks exacerbating the US housing crisis and threatening the broader economy, dozens of congressional Democrats have warned Donald Trump. …In a letter to Trump seen by the Guardian, Democrats noted that the US imports key construction materials worth billions of dollars – from lumber to cement products – from Canada and Mexico each year. “Given the severe housing shortage, compounded by rising construction costs, persistent supply chain disruptions, and an estimated shortfall of 6m homes, these looming tariffs, while intended to protect domestic industries, risk further exacerbating the housing supply and affordability crisis while stifling the development of new housing,” they wrote. More than 40 Democrats urged the White House to consider housebuilding industry estimates that the proposed tariffs will raise the cost of imported construction materials by up to $4bn.