Will the US bull market continue?

The S&P 500 rose 2.1 percent last week, gaining on Friday for a seventh consecutive session.

Ed Carson at Investor's Business Daily asked whether the US stock market is on the cusp of a long bullish phase.

"Look for the major indexes to convincingly clear their late 2018 peaks," he wrote. "That could happen soon, though the current stock market rally also could face resistance near the old highs. The fate of China trade talks and the upcoming earnings season likely will play a key role over the next few weeks."

Former Goldman Sachs Asset Management Chairman Jim O'Neill is not optimistic though.

O'Neill told CNBC last week that the US market was "definitely not cheap" and "very sensitive" to any bad news.

"We might be entering the end of the 10-year almost clear bull market in equities," he said.