Senior citizens shouldn’t be paying taxes on their Social Security benefits, former President Donald Trump said Wednesday, floating an idea that could lighten the federal income-tax load for about 40% of recipients. At the same time, a tax exemption of this magnitude could also speed up the financial woes for Social Security and add a deep bruise to the deficit, according to one analysis. ... If an individual’s combined income is between $25,000 and $34,000, they’ll pay income taxes on up to half of their benefits. Past the $34,000 mark, up to 85% of the benefits are taxable depending on...