April 28 (Reuters) - The following are the top stories in the Wall Street Journal. Reuters has not verified these stories and does not vouch for their accuracy.
- Valeant Pharmaceuticals Inc is planning sweeping changes to its board of directors as it moves to set a new tone at the top of a company under fire from politicians and investors for its management and drug-pricing practices. (on.wsj.com/1VDiTrc)
- Republican presidential front-runner Donald Trump, emboldened by fresh primary wins this week and pivoting toward a likely general-election fight, called Wednesday for the U.S. to pull back from its global engagements, marking a decisive break from recent Republican orthodoxy. (on.wsj.com/1SRs8U7)
- Federal Reserve officials left interest rates unchanged and remained ambiguous about raising rates in June as mixed global economic signals and low inflation at home weighed on policy makers struggling to spark robust growth seven years after the recession's end. (on.wsj.com/1SKyfqj)
- Facebook Inc reinforced its standing as a mobile-advertising powerhouse, nearly tripling its quarterly profit at a time when its Silicon Valley rivals are underperforming. (on.wsj.com/243U5NR) (Compiled by Aurindom Mukherjee in Bengaluru)