Billionaire Warren Buffett says the border adjustment tax proposal Republicans are considering would effectively increase the price of imports. Buffett says if retailers like the Berkshire Hathaway-owned Nebraska Furniture Mart has to pay more taxes on imports, that will increase the price consumers pay. [...] Buffett says he thinks it's likely Republicans will drop the border-adjustment tax proposal because it would be difficult to pass such a dramatic change in tax policy quickly. Buffett says he generally agrees with what Trump says about entitlement programs and Social Security, and some industries do face too many regulations. Buffett says he will judge Trump's presidency four years from now based on how safe he has kept the country, how the economy is doing and on how many people are sharing in the wealth. Buffett says it is a mistake to mix up political decisions with investing ones.