Scottish nationalist leader Humza Yousaf pledged Tuesday to use Britain's next general election to push for independence, even if his party loses several seats as expected.Yousaf told the Scottish National Party (SNP) conference in Aberdeen that he was committed to building "sustained majority" support for Scotland becoming independent from the UK. The SNP will claim it has "a mandate for independence negotiations" with the British government if it wins a majority of Scottish seats at the UK ele