1. Red markets

There's a very negative mood the markets. Downward momentum on Friday has carried through into the new week.

U.S. stock futures are all pushing down. Many European markets are dropping by about 1.5% in early trading. And Asian markets are closing out the day with losses.

Banking stocks are among the main losers right now. Germany's Deutsche Bank (DB) is falling by nearly 7% to its lowest level in over 20 years. A German magazine reported over the weekend that the German government won't get involved in a dispute between the bank and the U.S. Justice Department, which is demanding $14 billion over allegations Deutsche packaged up toxic mortgages between 2005 and 2007.

The same report claimed that the German government would not bail out Deutsche Bank if necessary.

2. Trump vs Clinton showdown

Investors will be watching closely as history is made Monday night when Hillary Clinton squares off against Donald Trump in the first presidential debate.

Polls show it's a close race. The outcome of the debate could decide who leads the country for the next four years.

"The presidential debates matter to markets because the market implications of the election outcome are quite divergent," said Paul Donovan, global chief economist at UBS Wealth Management. "The debate offers an opportunity for the candidates to spell out their economic policies; of course that opportunity may not be taken."

3. JPY jumps after Kuroda remarks

In his first speech since the Bank of Japan's decision last week to overhaul its radical stimulus program, Governor Haruhiko Kuroda said the central bank remained ready to use every available tool to achieve its 2% inflation target, including cutting interest rates further into negative territory.

The USD fell 0.5% against the yen to 100.47, moving back toward a one-month low of 100.06 touched last week.

The BOJ made an unexpected shift last week to targeting interest rates on government bonds as a way to reach its inflation target.

4. Oil developments

OPEC nations and other global oil producers will be huddling at a meeting in Algeria this week. They're considering an agreement to restrain production in an effort to support oil prices.

Few analysts expect a deal would solve the global oil glut because OPEC producers are pumping record amounts. Crude futures are holding steady and trading around $44.50 per barrel.