LOS ANGELES (CBSLA/AP) —President Barack Obama kicked off a roughly 23-hour swing through the Southland Monday that will include appearances at a pair of fundraisers, a late-night TV appearance, and the usual traffic nightmare.

The president landed at Los Angeles International Airport shortly before 1:30 p.m., and was greeted as he got off the plane by Mayor Eric Garcetti and Los Angeles County Supervisor Mark Ridley-Thomas.

READ MORE: Orange County Qualifies To Move Into Least-Restrictive Yellow Tier

After a brief conversation, Obama boarded a helicopter en route to his first destination: a $100,000-per-person evening fundraiser in Beverly Hills on behalf of Hillary Clinton’s presidential campaign.

The fundraiser will be held at the home of DreamWorks Animation CEO Jeffrey Katzenberg and his wife Marilyn, according to an invitation obtained by City News Service. It marks the fourth Clinton campaign fundraiser in the Los Angeles area in seven weeks with a $100,000 price tag.

Obama is putting more emphasis on helping Democrats in close Senate and House races with a strategy that ties their Republican opponents to Donald Trump — regardless of whether they support the GOP nominee.

With Clinton leading in several polls, Obama said Monday that Republicans are arguing they need to provide a check on her agenda in Congress. Obama said Democrats need to recognize that would lead to more gridlock.

“It is really important that we push back and defeat this argument that somehow the duly elected president of the United States should simply be blocked from doing anything by the opposition party,” Obama told donors at a fundraiser. “They’re not making the argument that they want to work with her to get things done. They are saying we are going to say no to everything.”

The president’s strategy was on full display Sunday in two separate events that opened a three-day swing on the West Coast. Obama said it was too late for GOP Rep. Joe Heck of Nevada to say he could not support Trump. Heck is seeking the seat now held by five-term Sen. Harry Reid, and a Heck victory would make it much harder for Democrats to gain the majority in the Senate.

Obama pointed to statements where Heck previously had said he had high hopes that Trump would be president and said he trusted him with the nation’s nuclear code for launching a strike.

“Now, I understand Joe Heck now wishes he never said those things about Donald Trump. But they’re on tape. They’re on the record. And now that Trump’s poll numbers are cratering, suddenly he says, well, no, I’m not supporting him,” Obama said. “Too late. You don’t get credit for that.”

READ MORE: Police Identify Homeless Man Arrested In Palisades Fire

Later, the president singled out GOP Rep. Darrell Issa of California, who once said Obama’s administration was perhaps one of the most corrupt in history.

“This guy has spent all his time simply trying to obstruct, to feed the same sentiments that resulted in Donald Trump becoming their nominee,” Obama said, then noting that somebody had told him “Darrell Issa was Trump before Trump”.

On Monday, Issa said he was disappointed but not surprised by Obama’s comments, arguing that the president “continues to deny accountability for the serious scandals that happened under his watch where Americans died overseas and veterans have died here at home.”

Obama’s zingers at the two GOP candidates come as the president broadens his focus beyond the White House race to include Democratic candidates for governor, Senate and House, including 30 House candidates Obama was expected to endorse.

In an unusual move for a president, Obama is looking even further down the ballot to state legislative races. All told, Obama has or plans to endorse 150 candidates for statehouses across the U.S. before Election Day, according to Democratic officials.

Though state lawmakers don’t vote on federal policies, they play an outsize role in most states in determining the way congressional lines are redrawn every 10 years. Republicans control most statehouses, and Democrats argue districts have been carved in ways that put their U.S. House candidates at a disadvantage.

To that end, Obama plans to throw his efforts, after leaving office, behind a Democratic campaign led by former Attorney General Eric Holder to make the next round of redistricting, in 2020, less titled toward Republicans.

For much of his presidency, Democrats griped privately that Obama was less enthusiastic about devoting time and resources toward building up his party than they had wanted him to be. This year, just as he prepares to leave office, he seems to be approaching the task with newfound interest.

On the federal level, Obama has already cut TV ads for 10 U.S. House and Senate candidates, including in states like Illinois, Florida and Pennsylvania where Democrats are hoping to oust incumbent GOP senators. He’s recorded another 11 radio spots while fundraising at an aggressive pace: 21 fundraisers for the Democratic campaign committees working on congressional and gubernatorial races, plus other events for individual candidates.

MORE NEWS: 'Midnight Run,' 'Beethoven' Star Charles Grodin Dies At 86

(TM and © Copyright 2016 CBS Local Media, a division of CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2016 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)